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RESEARCH PRODUCT

Spin caloric effects in antiferromagnets assisted by an external spin current

Olena GomonayJairo SinovaKei YamamotoKei Yamamoto

subject

PhysicsAcoustics and UltrasonicsCondensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsMagnonFOS: Physical sciencesInsulator (electricity)02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsTemperature gradientHeat fluxSeebeck coefficient0103 physical sciencesThermoelectric effectMesoscale and Nanoscale Physics (cond-mat.mes-hall)AntiferromagnetismCondensed Matter::Strongly Correlated Electrons010306 general physics0210 nano-technologyCurrent density

description

Searching for novel spin caloric effects in antiferromagnets we study the properties of thermally activated magnons in the presence of an external spin current and temperature gradient. We predict the spin Peltier effect -- generation of a heat flux by spin accumulation -- in an antiferromagnetic insulator with cubic or uniaxial magnetic symmetry. This effect is related with spin-current induced splitting of the relaxation times of the magnons with opposite spin direction. We show that the Peltier effect can trigger antiferromagnetic domain wall motion with a force whose value grows with the temperature of a sample. At a temperature, larger than the energy of the low-frequency magnons, this force is much larger than the force caused by direct spin transfer between the spin current and the domain wall. We also demonstrate that the external spin current can induce the magnon spin Seebeck effect. The corresponding Seebeck coefficient is controlled by the current density. These spin-current assisted caloric effects open new ways for the manipulation of the magnetic states in antiferromagnets.

yearjournalcountryeditionlanguage
2018-03-21
https://dx.doi.org/10.48550/arxiv.1803.07949