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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.16592">arXiv:2308.16592</a> <span> [<a href="https://arxiv.org/pdf/2308.16592">pdf</a>, <a href="https://arxiv.org/format/2308.16592">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Encoding information onto the charge and spin state of a paramagnetic atom using MgO tunnelling spintronics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lamblin%2C+M">Mathieu Lamblin</a>, <a href="/search/cond-mat?searchtype=author&query=Chowrira%2C+B">Bhavishya Chowrira</a>, <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">Victor Da Costa</a>, <a href="/search/cond-mat?searchtype=author&query=Vileno%2C+B">Bertrand Vileno</a>, <a href="/search/cond-mat?searchtype=author&query=Joly%2C+L">Loic Joly</a>, <a href="/search/cond-mat?searchtype=author&query=Boukari%2C+S">Samy Boukari</a>, <a href="/search/cond-mat?searchtype=author&query=Weber%2C+W">Wolfgang Weber</a>, <a href="/search/cond-mat?searchtype=author&query=Bernard%2C+R">Romain Bernard</a>, <a href="/search/cond-mat?searchtype=author&query=Gobaut%2C+B">Benoit Gobaut</a>, <a href="/search/cond-mat?searchtype=author&query=Hehn%2C+M">Michel Hehn</a>, <a href="/search/cond-mat?searchtype=author&query=Lacour%2C+D">Daniel Lacour</a>, <a href="/search/cond-mat?searchtype=author&query=Bowen%2C+M">Martin Bowen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2308.16592v1-abstract-short" style="display: inline;"> An electrical current that flows across individual atoms or molecules can generate exotic quantum-based behavior, from memristive effects to Coulomb blockade and the promotion of quantum excited states. These fundamental effects typically appear one at a time in model junctions built using atomic tip or lateral techniques. So far, however, a viable industrial pathway for such discrete state device… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.16592v1-abstract-full').style.display = 'inline'; document.getElementById('2308.16592v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.16592v1-abstract-full" style="display: none;"> An electrical current that flows across individual atoms or molecules can generate exotic quantum-based behavior, from memristive effects to Coulomb blockade and the promotion of quantum excited states. These fundamental effects typically appear one at a time in model junctions built using atomic tip or lateral techniques. So far, however, a viable industrial pathway for such discrete state devices has been lacking. Here, we demonstrate that a commercialized device platform can serve as this industrial pathway for quantum technologies. We have studied magnetic tunnel junctions with a MgO barrier containing C atoms. The paramagnetic localized electrons due to individual C atoms generate parallel nanotransport paths across the micronic device as deduced from magnetotransport experiments. Coulomb blockade effects linked to tunnelling magnetoresistance peaks can be electrically controlled, leading to a persistent memory effect. Our results position MgO tunneling spintronics as a promising platform to industrially implement quantum technologies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.16592v1-abstract-full').style.display = 'none'; document.getElementById('2308.16592v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.06157">arXiv:2203.06157</a> <span> [<a href="https://arxiv.org/pdf/2203.06157">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0102920">10.1063/5.0102920 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Toward accurate polarization estimation in nanoscopic systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mohapatra%2C+S">Sambit Mohapatra</a>, <a href="/search/cond-mat?searchtype=author&query=Weber%2C+W">Wolfgang Weber</a>, <a href="/search/cond-mat?searchtype=author&query=Bowen%2C+M">Martin Bowen</a>, <a href="/search/cond-mat?searchtype=author&query=Boukari%2C+S">Samy Boukari</a>, <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">Victor Da Costa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.06157v1-abstract-short" style="display: inline;"> The nanoscopic characterization of ferroelectric thin films is crucial from their device application point of view. Standard characterization techniques are based on detecting the nanoscopic charge compensation current (switching current) caused by the polarization reversal in the ferroelectric. Owing to various surface and bulk limited mechanisms, leakage currents commonly appear during such meas… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.06157v1-abstract-full').style.display = 'inline'; document.getElementById('2203.06157v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.06157v1-abstract-full" style="display: none;"> The nanoscopic characterization of ferroelectric thin films is crucial from their device application point of view. Standard characterization techniques are based on detecting the nanoscopic charge compensation current (switching current) caused by the polarization reversal in the ferroelectric. Owing to various surface and bulk limited mechanisms, leakage currents commonly appear during such measurements, which are frequently subtracted using the device I-V characteristic by employing positive-up-negative-down (PUND) measurement scheme. By performing nanoscopic switching current measurements on a commonly used ferroelectric, BiFeO3, we show that such characterization methods may be prone to large errors in the polarization estimation on ferro-resistive samples, due to current background subtraction issues. Especially, when ferro-resistive behavior is associated with the polarization reversal of the ferroelectric thin film, background current subtraction is not accurate due to the mismatch of the I-V characteristics for the two polarization states. We show instead that removing the background current by an asymmetric least squares subtraction method, though not perfect, gives a much better estimation of the ferroelectric properties of the sample under study. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.06157v1-abstract-full').style.display = 'none'; document.getElementById('2203.06157v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.00419">arXiv:2203.00419</a> <span> [<a href="https://arxiv.org/pdf/2203.00419">pdf</a>, <a href="https://arxiv.org/format/2203.00419">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s13538-022-01167-8">10.1007/s13538-022-01167-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Using the Energy probability distribution zeros to obtain the critical properties of the two-dimensional anisotropic Heisenberg model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=de+Souza%2C+G+B+G">Gabriel Bruno Garcia de Souza</a>, <a href="/search/cond-mat?searchtype=author&query=da+Costa%2C+B+V">Bismarck Vaz da Costa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.00419v2-abstract-short" style="display: inline;"> In this paper we present a Monte Carlo study of the critical behavior of the easy axis anisotropic Heisenberg spin model in two dimensions. Based on the partial knowledge of the zeros of the energy probability distribution we determine with good precision the phase diagram of the model obtaining the critical temperature and exponents for several values of the anisotropy. Our results indicate that… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.00419v2-abstract-full').style.display = 'inline'; document.getElementById('2203.00419v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.00419v2-abstract-full" style="display: none;"> In this paper we present a Monte Carlo study of the critical behavior of the easy axis anisotropic Heisenberg spin model in two dimensions. Based on the partial knowledge of the zeros of the energy probability distribution we determine with good precision the phase diagram of the model obtaining the critical temperature and exponents for several values of the anisotropy. Our results indicate that the model is in the Ising universality class for any anisotropy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.00419v2-abstract-full').style.display = 'none'; document.getElementById('2203.00419v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 figures, 9 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.12519">arXiv:2110.12519</a> <span> [<a href="https://arxiv.org/pdf/2110.12519">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Organic ferroelectric Croconic Acid: A concise survey from bulk single crystals to thin films </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mohapatra%2C+S">Sambit Mohapatra</a>, <a href="/search/cond-mat?searchtype=author&query=Cherifi-Hertel%2C+S">Salia Cherifi-Hertel</a>, <a href="/search/cond-mat?searchtype=author&query=Kuppusamy%2C+S+K">Senthil Kumar Kuppusamy</a>, <a href="/search/cond-mat?searchtype=author&query=Schmerber%2C+G">Guy Schmerber</a>, <a href="/search/cond-mat?searchtype=author&query=Arabski%2C+J">Jacek Arabski</a>, <a href="/search/cond-mat?searchtype=author&query=Gobaut%2C+B">Benoit Gobaut</a>, <a href="/search/cond-mat?searchtype=author&query=Weber%2C+W">Wolfgang Weber</a>, <a href="/search/cond-mat?searchtype=author&query=Bowen%2C+M">Martin Bowen</a>, <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">Victor Da Costa</a>, <a href="/search/cond-mat?searchtype=author&query=Boukari%2C+S">Samy Boukari</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.12519v1-abstract-short" style="display: inline;"> Owing to prospective energy-efficient and environmentally benign applications, organic ferroelectric materials are useful and necessary alternative to inorganic ferroelectrics. Although the first discovered ferroelectric, Rochelle salt, was a salt of an organic compound, organic ferroelectrics have not been as abundant as the inorganic ones. Further, the small polarization values in the organic sy… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.12519v1-abstract-full').style.display = 'inline'; document.getElementById('2110.12519v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.12519v1-abstract-full" style="display: none;"> Owing to prospective energy-efficient and environmentally benign applications, organic ferroelectric materials are useful and necessary alternative to inorganic ferroelectrics. Although the first discovered ferroelectric, Rochelle salt, was a salt of an organic compound, organic ferroelectrics have not been as abundant as the inorganic ones. Further, the small polarization values in the organic systems discovered so far have been a demotivating factor for their applications. However, scientific interest and activities surrounding such materials, for the purpose of fundamental understanding and practical applications, have significantly risen lately, especially after the discovery of above-room-temperature ferroelectricity in croconic acid (4,5-dihydroxy-4-cyclopentene-1,2,3-trione, H2C5O5) crystals with polarization values rivalling those found in inorganic ferroelectrics. Its large polarization, organic nature, and vacuum sublimability make croconic acid an ideal candidate for non-toxic and lead-free device applications. In this review article, we survey the scientific activities carried out so far involving ferroelectricity in this novel material, paying equal attention to its bulk single crystal and thin film forms. While we discuss about the origin of ferroelectric order and the reversal of polarization in the bulk form, we also summarize the directions toward applications of the thin films. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.12519v1-abstract-full').style.display = 'none'; document.getElementById('2110.12519v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.03084">arXiv:2104.03084</a> <span> [<a href="https://arxiv.org/pdf/2104.03084">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Nanoscale reversal of stable room temperature ferroelectric polarization in organic croconic acid thin films </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mohapatra%2C+S">Sambit Mohapatra</a>, <a href="/search/cond-mat?searchtype=author&query=Beaurepaire%2C+E">Eric Beaurepaire</a>, <a href="/search/cond-mat?searchtype=author&query=Weber%2C+W">Wolfgang Weber</a>, <a href="/search/cond-mat?searchtype=author&query=Bowen%2C+M">Martin Bowen</a>, <a href="/search/cond-mat?searchtype=author&query=Boukari%2C+S">Samy Boukari</a>, <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">Victor Da Costa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.03084v1-abstract-short" style="display: inline;"> It was discovered in 2010 that Croconic Acid, in its crystal form, has the highest polarization among organic ferroelectrics. In the context of eliminating toxic substances from electronic devices, Croconic Acid has a great potential as a sublimable lead-free ferroelectric. However, studies on ferroelectric properties of its thin films are only in their early stages and its capability to be incorp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.03084v1-abstract-full').style.display = 'inline'; document.getElementById('2104.03084v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.03084v1-abstract-full" style="display: none;"> It was discovered in 2010 that Croconic Acid, in its crystal form, has the highest polarization among organic ferroelectrics. In the context of eliminating toxic substances from electronic devices, Croconic Acid has a great potential as a sublimable lead-free ferroelectric. However, studies on ferroelectric properties of its thin films are only in their early stages and its capability to be incorporated in nanoscale devices is unknown. In this work, we demonstrate, upon ferroelectric switching at the nanoscale, stable and enduring room temperature polarization with no leakage current in Croconic Acid thin films. We thus show that it is a promising lead-free organic ferroelectric toward integration in nanoscale devices. The challenging switching current and polarization reversal characterization at the nanoscale was done using a unique combination of piezoresponse force microscopy, polarization switching current spectroscopy and the concurrent electromechanical strain response. Indeed, this combination can help to rationalize otherwise asymmetric polarization-voltage data and distorted hysteresis due to current jumps below the background noise, which are statistically washed away in macrojunctions but become prevalent at the nanoscale. These results are valid irrespective of the ferroelectrics' nature, organic or inorganic. Beyond the potential of Croconic Acid as an ecological ferroelectric material in devices, our detection of a clear nanoscopic polarization switching current thus paves the way for a fundamental understanding and technological applications of the polarization reversal mechanism at the nanoscale. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.03084v1-abstract-full').style.display = 'none'; document.getElementById('2104.03084v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.10413">arXiv:2009.10413</a> <span> [<a href="https://arxiv.org/pdf/2009.10413">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1002/adma.202206688">10.1002/adma.202206688 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum advantage in a molecular spintronic engine that harvests thermal fluctuation energy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chowrira%2C+B">Bhavishya Chowrira</a>, <a href="/search/cond-mat?searchtype=author&query=Kandpal%2C+L">Lalit Kandpal</a>, <a href="/search/cond-mat?searchtype=author&query=Lamblin%2C+M">Mathieu Lamblin</a>, <a href="/search/cond-mat?searchtype=author&query=Ngassam%2C+F">Franck Ngassam</a>, <a href="/search/cond-mat?searchtype=author&query=Kouakou%2C+C">Charles-Ambroise Kouakou</a>, <a href="/search/cond-mat?searchtype=author&query=Zafar%2C+T">Talha Zafar</a>, <a href="/search/cond-mat?searchtype=author&query=Mertz%2C+D">Damien Mertz</a>, <a href="/search/cond-mat?searchtype=author&query=Vileno%2C+B">Bertrand Vileno</a>, <a href="/search/cond-mat?searchtype=author&query=Kieber%2C+C">Christophe Kieber</a>, <a href="/search/cond-mat?searchtype=author&query=Versini%2C+G">Gilles Versini</a>, <a href="/search/cond-mat?searchtype=author&query=Gobaut%2C+B">Benoit Gobaut</a>, <a href="/search/cond-mat?searchtype=author&query=Joly%2C+L">Loic Joly</a>, <a href="/search/cond-mat?searchtype=author&query=Ferte%2C+T">Tom Ferte</a>, <a href="/search/cond-mat?searchtype=author&query=Monteblanco%2C+E">Elmer Monteblanco</a>, <a href="/search/cond-mat?searchtype=author&query=Bahouka%2C+A">Armel Bahouka</a>, <a href="/search/cond-mat?searchtype=author&query=Bernard%2C+R">Romain Bernard</a>, <a href="/search/cond-mat?searchtype=author&query=Mohapatra%2C+S">Sambit Mohapatra</a>, <a href="/search/cond-mat?searchtype=author&query=Garcia%2C+H+P">H. Prima Garcia</a>, <a href="/search/cond-mat?searchtype=author&query=Elidrissi%2C+S">S. Elidrissi</a>, <a href="/search/cond-mat?searchtype=author&query=Gavara%2C+M">M. Gavara</a>, <a href="/search/cond-mat?searchtype=author&query=Sternitzky%2C+E">Emmanuel Sternitzky</a>, <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">Victor Da Costa</a>, <a href="/search/cond-mat?searchtype=author&query=Hehn%2C+M">Michel Hehn</a>, <a href="/search/cond-mat?searchtype=author&query=Montaigne%2C+F">Francois Montaigne</a>, <a href="/search/cond-mat?searchtype=author&query=Choueikani%2C+F">Fadi Choueikani</a> , et al. (6 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.10413v4-abstract-short" style="display: inline;"> Recent theory and experiments have showcased how to harness quantum mechanics to assemble heat/information engines with efficiencies that surpass the classical Carnot limit. So far, this has required atomic engines that are driven by cumbersome external electromagnetic sources. Here, using molecular spintronics, we propose an implementation that is both electronic and autonomous. Our spintronic qu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.10413v4-abstract-full').style.display = 'inline'; document.getElementById('2009.10413v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.10413v4-abstract-full" style="display: none;"> Recent theory and experiments have showcased how to harness quantum mechanics to assemble heat/information engines with efficiencies that surpass the classical Carnot limit. So far, this has required atomic engines that are driven by cumbersome external electromagnetic sources. Here, using molecular spintronics, we propose an implementation that is both electronic and autonomous. Our spintronic quantum engine heuristically deploys several known quantum assets by having a chain of spin qubits formed by the paramagnetic Co centers of phthalocyanine (Pc) molecules electronically interact with electron-spin selecting Fe/C60 interfaces. Density functional calculations reveal that transport fluctuations across the interface can stabilize spin coherence on the Co paramagnetic centers, which host spin flip processes. Across vertical molecular nanodevices, we measure enduring dc current generation, output power above room temperature, two quantum thermodynamical signatures of the engine's processes, and a record 89% spin polarization of current across the Fe/C60 interface. It is crucially this electron spin selection that forces, through demonic feedback and control, charge current to flow against the built-in potential barrier. Further research into spintronic quantum engines, insight into the quantum information processes within spintronic technologies, and retooling the spintronic-based information technology chain, could help accelerate the transition to clean energy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.10413v4-abstract-full').style.display = 'none'; document.getElementById('2009.10413v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">\</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.12660">arXiv:2006.12660</a> <span> [<a href="https://arxiv.org/pdf/2006.12660">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Vortices in Kekulene Molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Menicucci%2C+L">Lucas Menicucci</a>, <a href="/search/cond-mat?searchtype=author&query=Barreto%2C+F+C+S">Francisco C茅sar S谩 Barreto</a>, <a href="/search/cond-mat?searchtype=author&query=da+Costa%2C+B+v">Bismarck vaz da Costa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.12660v1-abstract-short" style="display: inline;"> Kekulene is an aromatic hydrocarbon with formula C48H24 arranged in the shape of a closed super-ring as shown in Fig. 2. It consists of a sublattice with 48 C atoms with spin 5/2 and a 24 hydrogen sublattice with spin 2. In this communication, we use Monte Carlo simulations to determine the magnetic structures present in Kekulene for several temperatures (T) and dipole anisotropies (未 = D/J). Our… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.12660v1-abstract-full').style.display = 'inline'; document.getElementById('2006.12660v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.12660v1-abstract-full" style="display: none;"> Kekulene is an aromatic hydrocarbon with formula C48H24 arranged in the shape of a closed super-ring as shown in Fig. 2. It consists of a sublattice with 48 C atoms with spin 5/2 and a 24 hydrogen sublattice with spin 2. In this communication, we use Monte Carlo simulations to determine the magnetic structures present in Kekulene for several temperatures (T) and dipole anisotropies (未 = D/J). Our results show that there are two regimes at low temperature separated by a crossover at 2.5 < 未cross < 3.0. For 未 < 未cross the ground state has a unique vortex configuration. In the region 未 > 未cross arrangements of vortices-antivortices (V-AV) appears. As temperature raises the vortex structure disorders and small oscillations take over. The importance on synthesizing this molecule grounds in the possibility of building real planar structures of sizes at least 10 times smaller than the earlier proposed permalloy nanodots. It is worthy to mention that Kekulene is a planar structure with atomic thickness, which is a great advantage compared with other nanomagnetic structures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.12660v1-abstract-full').style.display = 'none'; document.getElementById('2006.12660v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2004.04592">arXiv:2004.04592</a> <span> [<a href="https://arxiv.org/pdf/2004.04592">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Robust ferroelectric properties of organic Croconic Acid films grown on spintronically relevant substrates </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mohapatra%2C+S">Sambit Mohapatra</a>, <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">Victor Da Costa</a>, <a href="/search/cond-mat?searchtype=author&query=Avedissian%2C+G">Garen Avedissian</a>, <a href="/search/cond-mat?searchtype=author&query=Arabski%2C+J">Jacek Arabski</a>, <a href="/search/cond-mat?searchtype=author&query=Weber%2C+W">Wolfgang Weber</a>, <a href="/search/cond-mat?searchtype=author&query=Bowen%2C+M">Martin Bowen</a>, <a href="/search/cond-mat?searchtype=author&query=Boukari%2C+S">Samy Boukari</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2004.04592v1-abstract-short" style="display: inline;"> The discovery of stable room temperature ferroelectricity in Croconic Acid, an organic ferroelectric material, with polarization values on par with those found in inorganic ferroelectric materials and highest among organic ferroelectric materials, has opened up possibilities to realize myriads of nano-electronic and spintronic devices based on organic ferroelectrics. Such possibilities require an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.04592v1-abstract-full').style.display = 'inline'; document.getElementById('2004.04592v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2004.04592v1-abstract-full" style="display: none;"> The discovery of stable room temperature ferroelectricity in Croconic Acid, an organic ferroelectric material, with polarization values on par with those found in inorganic ferroelectric materials and highest among organic ferroelectric materials, has opened up possibilities to realize myriads of nano-electronic and spintronic devices based on organic ferroelectrics. Such possibilities require an adequate understanding of the ferroelectric properties of Croconic Acid grown on surfaces that are commonly employed in device fabrication. While several macroscopic studies on relatively larger crystals of Croconic Acid have been performed, studies on thin films are only in their early stages. We have grown thin films of Croconic Acid on gold and cobalt surfaces, which are commonly used in spintronic devices as metallic electrodes, and studied the ferroelectric response of the films using ex-situ Piezoresponse Force Microscopy at room temperature. We show that the polarization reversal in Croconic Acid domains is sensitive to the substrate surface. Using the same experimental protocol, we observe the robust polarization reversal of a single, mostly in-plane electrical domain for a cobalt substrate, whereas polarization reversal is hardly observed for a gold substrate. We attribute this difference to the influence of substrates on the Croconic Acid molecular networks. Our study suggests that to realize devices one has to take care about the substrate on which Croconic Acid will be deposited. The fact that polarization switching is robust on cobalt surface can be used to fabricate multifunctional devices that utilize the cobalt-Croconic Acid interface. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2004.04592v1-abstract-full').style.display = 'none'; document.getElementById('2004.04592v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 April, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 14 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.10578">arXiv:1910.10578</a> <span> [<a href="https://arxiv.org/pdf/1910.10578">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1002/adfm.202009467">10.1002/adfm.202009467 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetoresistance and spintronic anisotropy induced by spin excitations along molecular spin chains </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Katcko%2C+K">K. Katcko</a>, <a href="/search/cond-mat?searchtype=author&query=Urbain%2C+E">E. Urbain</a>, <a href="/search/cond-mat?searchtype=author&query=Kandpal%2C+L">L. Kandpal</a>, <a href="/search/cond-mat?searchtype=author&query=Chowrira%2C+B">B. Chowrira</a>, <a href="/search/cond-mat?searchtype=author&query=Schleicher%2C+F">F. Schleicher</a>, <a href="/search/cond-mat?searchtype=author&query=Halisdemir%2C+U">U. Halisdemir</a>, <a href="/search/cond-mat?searchtype=author&query=Ngassamnyakam%2C+F">F. Ngassamnyakam</a>, <a href="/search/cond-mat?searchtype=author&query=Mertz%2C+D">D. Mertz</a>, <a href="/search/cond-mat?searchtype=author&query=Leconte%2C+B">B. Leconte</a>, <a href="/search/cond-mat?searchtype=author&query=Beyer%2C+N">N. Beyer</a>, <a href="/search/cond-mat?searchtype=author&query=Spor%2C+D">D. Spor</a>, <a href="/search/cond-mat?searchtype=author&query=Panissod%2C+P">P. Panissod</a>, <a href="/search/cond-mat?searchtype=author&query=Boulard%2C+A">A. Boulard</a>, <a href="/search/cond-mat?searchtype=author&query=Arabski%2C+J">J. Arabski</a>, <a href="/search/cond-mat?searchtype=author&query=Kieber%2C+C">C. Kieber</a>, <a href="/search/cond-mat?searchtype=author&query=Sternitsky%2C+E">E. Sternitsky</a>, <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">V. Da Costa</a>, <a href="/search/cond-mat?searchtype=author&query=Alouani%2C+M">M. Alouani</a>, <a href="/search/cond-mat?searchtype=author&query=Hehn%2C+M">M. Hehn</a>, <a href="/search/cond-mat?searchtype=author&query=Montaigne%2C+F">F. Montaigne</a>, <a href="/search/cond-mat?searchtype=author&query=Bahouka%2C+A">A. Bahouka</a>, <a href="/search/cond-mat?searchtype=author&query=Weber%2C+W">W. Weber</a>, <a href="/search/cond-mat?searchtype=author&query=Beaurepaire%2C+E">E. Beaurepaire</a>, <a href="/search/cond-mat?searchtype=author&query=Lacour%2C+D">D. Lacour</a>, <a href="/search/cond-mat?searchtype=author&query=Boukari%2C+S">S. Boukari</a> , et al. (1 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.10578v2-abstract-short" style="display: inline;"> Electrically manipulating the quantum properties of nano-objects, such as atoms or molecules, is typically done using scanning tunnelling microscopes and lateral junctions. The resulting nanotransport path is well established in these model devices. Societal applications require transposing this knowledge to nano-objects embedded within vertical solid-state junctions, which can advantageously harn… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.10578v2-abstract-full').style.display = 'inline'; document.getElementById('1910.10578v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.10578v2-abstract-full" style="display: none;"> Electrically manipulating the quantum properties of nano-objects, such as atoms or molecules, is typically done using scanning tunnelling microscopes and lateral junctions. The resulting nanotransport path is well established in these model devices. Societal applications require transposing this knowledge to nano-objects embedded within vertical solid-state junctions, which can advantageously harness spintronics to address these quantum properties thanks to ferromagnetic electrodes and high-quality interfaces. The challenge here is to ascertain the device's effective, buried nanotransport path, and to electrically involve these nano-objects in this path by shrinking the device area from the macro- to the nano-scale while maintaining high structural/chemical quality across the heterostructure. We've developed a low-tech, resist- and solvent-free technological process that can craft nanopillar devices from entire in-situ grown heterostructures, and use it to study magnetotransport between two Fe and Co ferromagnetic electrodes across a functional magnetic CoPc molecular layer. We observe how spin-flip transport across CoPc molecular spin chains promotes a specific magnetoresistance effect, and alters the nanojunction's magnetism through spintronic anisotropy. In the process, we identify three magnetic units along the effective nanotransport path thanks to a macrospin model of magnetotransport. Our work elegantly connects the until now loosely associated concepts of spin-flip spectroscopy, magnetic exchange bias and magnetotransport due to molecular spin chains, within a solid-state device. We notably measure a 5.9meV energy threshold for magnetic decoupling between the Fe layer's buried atoms and those in contact with the CoPc layer forming the so-called 'spinterface'. This provides a first insight into the experimental energetics of this promising low-power information encoding unit. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.10578v2-abstract-full').style.display = 'none'; document.getElementById('1910.10578v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.07450">arXiv:1712.07450</a> <span> [<a href="https://arxiv.org/pdf/1712.07450">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/acs.nanolett.8b00570">10.1021/acs.nanolett.8b00570 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Disentangling magnetic hardening and molecular spin chain contributions to exchange bias in ferromagnet/molecule bilayers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Boukari%2C+S">Samy Boukari</a>, <a href="/search/cond-mat?searchtype=author&query=Jabbar%2C+H">Hashim Jabbar</a>, <a href="/search/cond-mat?searchtype=author&query=Schleicher%2C+F">Filip Schleicher</a>, <a href="/search/cond-mat?searchtype=author&query=Gruber%2C+M">Manuel Gruber</a>, <a href="/search/cond-mat?searchtype=author&query=Arabski%2C+J">Jacek Arabski</a>, <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">Victor Da Costa</a>, <a href="/search/cond-mat?searchtype=author&query=Schmerber%2C+G">Guy Schmerber</a>, <a href="/search/cond-mat?searchtype=author&query=Rengasamy%2C+P">Prashanth Rengasamy</a>, <a href="/search/cond-mat?searchtype=author&query=Vileno%2C+B">Bertrand Vileno</a>, <a href="/search/cond-mat?searchtype=author&query=Weber%2C+W">Wolfgang Weber</a>, <a href="/search/cond-mat?searchtype=author&query=Bowen%2C+M">Martin Bowen</a>, <a href="/search/cond-mat?searchtype=author&query=Beaurepaire%2C+E">Eric Beaurepaire</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1712.07450v1-abstract-short" style="display: inline;"> We performed SQUID and FMR magnetometry experiments to clarify the relationship between two reported magnetic exchange effects arising from interfacial spin-polarized charge transfer within ferromagnetic metal (FM)/molecule bilayers: the magnetic hardening effect, and spinterface-stabilized molecular spin chains. To disentangle these effects, both of which can affect the FM magnetization reversal,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.07450v1-abstract-full').style.display = 'inline'; document.getElementById('1712.07450v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.07450v1-abstract-full" style="display: none;"> We performed SQUID and FMR magnetometry experiments to clarify the relationship between two reported magnetic exchange effects arising from interfacial spin-polarized charge transfer within ferromagnetic metal (FM)/molecule bilayers: the magnetic hardening effect, and spinterface-stabilized molecular spin chains. To disentangle these effects, both of which can affect the FM magnetization reversal, we tuned the metal phthalocyanine molecule central site's magnetic moment to selectively enhance or suppress the formation of spin chains within the molecular film. We find that both effects are distinct, and additive. In the process, we 1) extended the list of FM/molecule candidate pairs that are known to generate magnetic exchange effects, 2) experimentally confirmed the predicted increase in anisotropy upon molecular adsorption; and 3) showed that spin chains within the molecular film can enhance magnetic exchange. This magnetic ordering within the organic layer implies a structural ordering. Thus, by distengangling the magnetic hardening and exchange bias contributions, our results confirm, as an echo to progress regarding inorganic spintronic tunnelling, that the milestone of spintronic tunnelling across structurally ordered organic barriers has been reached through previous magnetotransport experiments. This paves the way for solid-state devices studies that exploit the quantum physical properties of spin chains, notably through external stimuli. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.07450v1-abstract-full').style.display = 'none'; document.getElementById('1712.07450v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">None</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1207.0314">arXiv:1207.0314</a> <span> [<a href="https://arxiv.org/pdf/1207.0314">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.4731201">10.1063/1.4731201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Light controlled magnetoresistance and magnetic field controlled photoresistance in CoFe film deposited on BiFeO3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kundys%2C+B">B. Kundys</a>, <a href="/search/cond-mat?searchtype=author&query=Meny%2C+C">C. Meny</a>, <a href="/search/cond-mat?searchtype=author&query=Gibbs%2C+M+R+J">M. R. J. Gibbs</a>, <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">V. Da Costa</a>, <a href="/search/cond-mat?searchtype=author&query=Viret%2C+M">M. Viret</a>, <a href="/search/cond-mat?searchtype=author&query=Acosta%2C+M">M. Acosta</a>, <a href="/search/cond-mat?searchtype=author&query=Colson%2C+D">D. Colson</a>, <a href="/search/cond-mat?searchtype=author&query=Doudin%2C+B">B. Doudin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1207.0314v1-abstract-short" style="display: inline;"> We present a magnetoresistive-photoresistive device based on the interaction of a piezomagnetic CoFe thin film with a photostrictive BiFeO3 substrate that undergoes light-induced strain. The magnitude of the resistance and magnetoresistance in the CoFe film can be controlled by the wavelength of the incident light on the BiFeO3. Moreover, a light-induced decrease in anisotropic magnetoresistance i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.0314v1-abstract-full').style.display = 'inline'; document.getElementById('1207.0314v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1207.0314v1-abstract-full" style="display: none;"> We present a magnetoresistive-photoresistive device based on the interaction of a piezomagnetic CoFe thin film with a photostrictive BiFeO3 substrate that undergoes light-induced strain. The magnitude of the resistance and magnetoresistance in the CoFe film can be controlled by the wavelength of the incident light on the BiFeO3. Moreover, a light-induced decrease in anisotropic magnetoresistance is detected due to an additional magnetoelastic contribution to magnetic anisotropy of the CoFe film. This effect may find applications in photo-sensing systems, wavelength detectors and can possibly open a research development in light-controlled magnetic switching properties for next generation magnetoresistive memory devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1207.0314v1-abstract-full').style.display = 'none'; document.getElementById('1207.0314v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 July, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures, journal paper</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Appl. Phys. Lett. 100, 262411 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1203.6273">arXiv:1203.6273</a> <span> [<a href="https://arxiv.org/pdf/1203.6273">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.85.092301">10.1103/PhysRevB.85.092301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photostriction in BiFeO3: wavelength dependence </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kundys%2C+B">B. Kundys</a>, <a href="/search/cond-mat?searchtype=author&query=Viret%2C+M">M. Viret</a>, <a href="/search/cond-mat?searchtype=author&query=Meny%2C+C">C. Meny</a>, <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">V. Da Costa</a>, <a href="/search/cond-mat?searchtype=author&query=Colson%2C+D">D. Colson</a>, <a href="/search/cond-mat?searchtype=author&query=Doudin%2C+B">B. Doudin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1203.6273v1-abstract-short" style="display: inline;"> In electrically polar solids optomechanical effects result from the combination of two main processes, electric field-induced strain and photon-induced voltages. Whereas the former depends on the electrostrictive ability of the sample to convert electric energy into mechanical energy, the latter is caused by the capacity of photons with appropriate energy to generate charges and, therefore, can de… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1203.6273v1-abstract-full').style.display = 'inline'; document.getElementById('1203.6273v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1203.6273v1-abstract-full" style="display: none;"> In electrically polar solids optomechanical effects result from the combination of two main processes, electric field-induced strain and photon-induced voltages. Whereas the former depends on the electrostrictive ability of the sample to convert electric energy into mechanical energy, the latter is caused by the capacity of photons with appropriate energy to generate charges and, therefore, can depend on wavelength.We report here on mechanical deformation of BiFeO3 and its response time to discrete wavelengths of incident light ranging from 365 to 940 nm. The mechanical response of BiFeO3 is found to have two maxima in near-UV and green spectral wavelength regions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1203.6273v1-abstract-full').style.display = 'none'; document.getElementById('1203.6273v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 March, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Photostriction in BFO, 4 pages, 5 figures, Phys. Rev. B. 85, 092301 (2012)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B. 85, 092301 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0211065">arXiv:physics/0211065</a> <span> [<a href="https://arxiv.org/pdf/physics/0211065">pdf</a>, <a href="https://arxiv.org/ps/physics/0211065">ps</a>, <a href="https://arxiv.org/format/physics/0211065">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjb/e2003-00131-6">10.1140/epjb/e2003-00131-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Broad distribution effects in sums of lognormal random variables </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Romeo%2C+M">M. Romeo</a>, <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">V. Da Costa</a>, <a href="/search/cond-mat?searchtype=author&query=Bardou%2C+F">F. Bardou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="physics/0211065v2-abstract-short" style="display: inline;"> The lognormal distribution describing, e.g., exponentials of Gaussian random variables is one of the most common statistical distributions in physics. It can exhibit features of broad distributions that imply qualitative departure from the usual statistical scaling associated to narrow distributions. Approximate formulae are derived for the typical sums of lognormal random variables. The validit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0211065v2-abstract-full').style.display = 'inline'; document.getElementById('physics/0211065v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0211065v2-abstract-full" style="display: none;"> The lognormal distribution describing, e.g., exponentials of Gaussian random variables is one of the most common statistical distributions in physics. It can exhibit features of broad distributions that imply qualitative departure from the usual statistical scaling associated to narrow distributions. Approximate formulae are derived for the typical sums of lognormal random variables. The validity of these formulae is numerically checked and the physical consequences, e.g., for the current flowing through small tunnel junctions, are pointed out. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0211065v2-abstract-full').style.display = 'none'; document.getElementById('physics/0211065v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 March, 2003; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 November, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2002. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 9 figures. Minor changes + Gini coefficient and 4 refs. added</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. B 32, 513-525 (2003) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/cond-mat/0205473">arXiv:cond-mat/0205473</a> <span> [<a href="https://arxiv.org/pdf/cond-mat/0205473">pdf</a>, <a href="https://arxiv.org/ps/cond-mat/0205473">ps</a>, <a href="https://arxiv.org/format/cond-mat/0205473">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/S0304-8853(02)01122-8">10.1016/S0304-8853(02)01122-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Statistical properties of currents flowing through tunnel junctions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Da+Costa%2C+V">V. Da Costa</a>, <a href="/search/cond-mat?searchtype=author&query=Romeo%2C+M">M. Romeo</a>, <a href="/search/cond-mat?searchtype=author&query=Bardou%2C+F">F. Bardou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="cond-mat/0205473v2-abstract-short" style="display: inline;"> This paper presents an overview of the statistical properties arising from the broadness of the distribution of tunnel currents in metal-insulator-metal tunnel junctions. Experimental current inhomogeneities can be modelled by a lognormal distribution and the size dependence of the tunnel current is modified at small sizes by the effect of broad distributions. </span> <span class="abstract-full has-text-grey-dark mathjax" id="cond-mat/0205473v2-abstract-full" style="display: none;"> This paper presents an overview of the statistical properties arising from the broadness of the distribution of tunnel currents in metal-insulator-metal tunnel junctions. Experimental current inhomogeneities can be modelled by a lognormal distribution and the size dependence of the tunnel current is modified at small sizes by the effect of broad distributions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('cond-mat/0205473v2-abstract-full').style.display = 'none'; document.getElementById('cond-mat/0205473v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 July, 2002; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 May, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2002. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures, accepted for publication in J. Magn. Magn. Mater., Moscow International Symposium on Magnetism (June 20-24, 2002), shortened, eq. (4) corrected</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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