0000000000054695

AUTHOR

Jun'ichi Ieda

showing 3 related works from this author

Electric voltage generation by antiferromagnetic dynamics

2015

We theoretically demonstrate dc and ac electric voltage generation due to spinmotive forces originating from domain wall motion and magnetic resonance, respectively, in two-sublattice antiferromagnets. Our theory accounts for the canting between the sublattice magnetizations, the nonadiabatic electron spin dynamics, and the Rashba spin-orbit coupling, with the inter-sublattice electron dynamics treated as a perturbation. This work suggests a new way to observe and explore the dynamics of antiferromagnetic textures by electrical means, an important aspect in the emerging field of antiferromagnetic spintronics, where both manipulation and detection of antiferromagnets are needed.

PhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsSpintronicsFOS: Physical sciencesPerturbation (astronomy)02 engineering and technologyElectron dynamics021001 nanoscience & nanotechnology01 natural sciencesCondensed Matter::Materials ScienceMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesAntiferromagnetismCondensed Matter::Strongly Correlated Electrons010306 general physics0210 nano-technologySpin (physics)VoltagePhysical Review B
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Spinmotive force due to motion of magnetic bubble arrays driven by magnetic field gradient

2014

Interaction between local magnetization and conduction electrons is responsible for a variety of phenomena in magnetic materials. It has been recently shown that spin current and associated electric voltage can be induced by magnetization that depends on both time and space. This effect, called spinmotive force, provides for a powerful tool for exploring the dynamics and the nature of magnetic textures, as well as a new source for electromotive force. Here we theoretically demonstrate the generation of electric voltages in magnetic bubble array systems subjected to a magnetic field gradient. It is shown by deriving expressions for the electric voltages that the present system offers a direc…

PhysicsMagnetization dynamicsMultidisciplinaryCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsSpintronicsElectromotive forceFOS: Physical sciencesElectronThermal conductionArticleMagnetizationMesoscale and Nanoscale Physics (cond-mat.mes-hall)Current (fluid)VoltageScientific Reports
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Spin-transfer torques in antiferromagnetic textures: Efficiency and quantification method

2016

We formulate a theory of spin-transfer torques in textured antiferromagnets, which covers the small to large limits of the exchange coupling energy relative to the kinetic energy of the intersublattice electron dynamics. Our theory suggests a natural definition of the efficiency of spin-transfer torques in antiferromagnets in terms of well-defined material parameters, revealing that the charge current couples predominantly to the antiferromagnetic order parameter and the sublattice-canting moment in, respectively, the limits of large and small exchange coupling. The effects can be quantified by analyzing the antiferromagnetic spin-wave dispersions in the presence of charge current: in the l…

PhysicsCouplingCondensed matter physics02 engineering and technology021001 nanoscience & nanotechnologyKinetic energy01 natural sciencessymbols.namesake0103 physical sciencesMoment (physics)symbolsAntiferromagnetismTorqueSpin transferCondensed Matter::Strongly Correlated ElectronsLimit (mathematics)010306 general physics0210 nano-technologyDoppler effectPhysical Review B
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