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Multifunctional complex oxide soft magnetic materials are interesting for their potential applications in microwave communications as tunable signal filters, phase shifters, and resonators. The use of magnetoelectric nanostructures comprised of magnetic pillars embedded in a ferroelectric matrix sys... more
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As the bit size in magnetic data storage approaches the
superparamagnetic limit, increasing the magnetic anisotropy
is needed to ensure bit stability, which in turn requires an
undesirable strong switching field. In this work,
we propose a way to enable low-field magnetic
recording in hig... more
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The ternary intermetallic nickel—manganese—gallium has been known for over a decade as a ferromagnetic shape memory compound. In other words, this material both undergoes a martensitic transition and the magnetocrystalline anisotropy in the low-temperature phase couples the magnetic easy axis to... more
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Exchange bias refers to the shift of the magnetic hysteresis loop of a ferromagnet, which is caused by the hard magnetization of an antiferromagnet that is in contact with it. Although exchange bias is tremendously important because of its potential technological applications in spintronics, the co... more
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Magnetoelectric multiferroics – materials that exhibit both electronic
and magnetic order—present a fascinating opportunity to study coupling
phenomena in complex correlated oxides. The promise of
electrically-tunable magnetic properties has led such materials to be
the focus of much resear... more
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Electric field control of ferromagnetism is an exciting new area of condensed matter research with the potential to impact magnetic data storage, spintronics, and high frequency magnetic devices. Magnetoelectric multiferroics, or materials that simultaneously show some form of magnetic and ferroele... more
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Many interesting phenomena as metal-insulator transition, colossal
magnetoresistance, and high-Tc superconductivity can be obtained by adding
carriers to insulating parent compounds. The Ca doping effect in a
multiferroic BiFeO3 is investigated. Interestingly we could observe
electric... more
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Thermoelectric materials are those which show an appreciable Seebeck coefficient ("thermopower", Volts/Kelvin) and efficiency in converting a thermal gradient to an electric current in the solid-state. Over fifty percent of the world's 10+ Terrawatts of power produced is lost as waste heat. The abil... more
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Ferroelectric Pb(Zr,Ti)O3 (PZT) thin films are discussed as material for new memory devices. Besides the often mentioned Ferroelectric Random Access Memories (FeRAM), probe based memory devices are also discussed as new possibility for information storage. In this case the information is ... more
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The research in the group of Prof. Salmeron is centered on the nanometer scale mechanical, chemical and physical properties of surfaces and interfaces.... more
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Transmission electron microscopy image of a novel composite La-Ca-Sr metaphosphate proton conductor prepared by crystallization of the corresponding glass. Material of this type may one day enable novel fuel cells that can use hydrogen or biomass-derived fuels. The inset shows the proton path based ... more
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In situ transmission electron microscopy reveals a large melting point hysteresis for Ge nanocrystals embedded in silica. The center point of the hysteresis loop nearly coincides with the bulk melting point of Ge. This extremely unusual behavior is argued to be a natural result of the kinetics of ... more
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