0000000000385610

AUTHOR

Jan Zemen

showing 3 related works from this author

Relativistic Neel-order fields induced by electrical current in antiferromagnets

2014

We predict that a lateral electrical current in antiferromagnets can induce non-equilibrium N\'eel order fields, i.e. fields whose sign alternates between the spin sublattices, which can trigger ultra-fast spin-axis reorientation. Based on microscopic transport theory calculations we identify staggered current-induced fields analogous to the intra-band and to the intrinsic inter-band spin-orbit fields previously reported in ferromagnets with a broken inversion-symmetry crystal. To illustrate their rich physics and utility, we considered bulk Mn2Au with the two spin sublattices forming inversion partners, and a 2D square-lattice antiferromagnet with broken structural inversion symmetry model…

PhysicsCondensed Matter - Materials ScienceCondensed matter physicsPoint reflectionGeneral Physics and AstronomyNon-equilibrium thermodynamicsMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesTransport theory3. Good healthElectrical currentFerromagnetismQuantum mechanicsAntiferromagnetismCondensed Matter::Strongly Correlated ElectronsUltrashort pulse
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Large Tunneling Anisotropic Magneto-Seebeck Effect in a CoPt|MgO|Pt Tunnel Junction

2014

We theoretically investigate the Tunneling Anisotropic Magneto-Seebeck effect in a realistically-modeled CoPt|MgO|Pt tunnel junction using coherent transport calculations. For comparison we study the tunneling magneto-Seebeck effect in CoPt|MgO|CoPt as well. We find that the magneto-Seebeck ratio of CoPt|MgO|Pt exceeds that of CoPt|MgO|CoPt for small barrier thicknesses, reaching 175% at room temperature. This result provides a sharp contrast to the magnetoresistance, which behaves oppositely for all barrier thicknesses and differs by one order of magnitude between devices. Here the magnetoresistance results from differences in transmission brought upon by changing the tunnel junction's mag…

Materials scienceCondensed matter physicsMagnetoresistanceCondensed Matter - Mesoscale and Nanoscale PhysicsFOS: Physical sciences02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter PhysicsCoupling (probability)Condensed Matter::Mesoscopic Systems and Quantum Hall Effect01 natural sciencesElectronic Optical and Magnetic MaterialsCondensed Matter::Materials ScienceFerromagnetismTunnel junctionCondensed Matter::Superconductivity0103 physical sciencesThermoelectric effectMesoscale and Nanoscale Physics (cond-mat.mes-hall)010306 general physics0210 nano-technologyAnisotropyOrder of magnitudeQuantum tunnelling
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Spin-orbit torques in locally and globally non-centrosymmetric crystals: Antiferromagnets and ferromagnets

2016

One of the main obstacles that prevents practical applications of antiferromagnets is the difficulty of manipulating the magnetic order parameter. Recently, following the theoretical prediction [J. \v{Z}elezn\'y et al., PRL 113, 157201 (2014)], the electrical switching of magnetic moments in an antiferromagnet has been demonstrated [P. Wadley et al., Science 351, 587 (2016)]. The switching is due to the so-called spin-orbit torque, which has been extensively studied in ferromagnets. In this phenomena a non-equilibrium spin-polarization exchange coupled to the ordered local moments is induced by current, hence exerting a torque on the order parameter. Here we give a general systematic analys…

PhysicsCondensed Matter - Materials ScienceMagnetic momentCondensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciences02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesSymmetry (physics)FerromagnetismOrientation (geometry)0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)Orbit (dynamics)TorqueAntiferromagnetismddc:530Condensed Matter::Strongly Correlated ElectronsAstrophysics::Earth and Planetary Astrophysics010306 general physics0210 nano-technologySpin (physics)
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