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RESEARCH PRODUCT
Spin pumping in noncollinear antiferromagnets
Kjetil M. D. HalsMike A. LundAkshaykumar Salimathsubject
PhysicsSpin pumpingCondensed Matter - Materials ScienceField (physics)Condensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsOrthogonal polarization spectral imagingPhase (waves)Materials Science (cond-mat.mtrl-sci)FOS: Physical sciencesMagnetic fieldMesoscale and Nanoscale Physics (cond-mat.mes-hall)Dissipative systemAntiferromagnetismCondensed Matter::Strongly Correlated ElectronsSpin-½description
The ac spin pumping of noncollinear antiferromagnets is theoretically investigated. Starting from an effective action description of the spin system, we derive the Onsager coefficients connecting the spin pumping and spin-transfer torque associated with the dynamics of the SO(3)-valued antiferromagnetic order parameter. Our theory is applied to a kagome antiferromagnet resonantly driven by a uniform external magnetic field. We demonstrate that the reactive (dissipative) spin-transfer torque parameter can be extracted from the pumped ac spin current in-phase (in quadrature) with the driving field. Furthermore, we find that the three spin-wave bands of the kagome AF generate spin currents with mutually orthogonal polarization directions. This offers a unique way of controlling the spin orientation of the pumped spin current by exciting different spin-wave modes.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-11-18 |