Self-induced spin-orbit torques in metallic ferromagnets
| Autor: | Ricardo Zarzuela, Hector Ochoa, Yaroslav Tserkovnyak |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Spintronics Condensed matter physics Magnetoresistance Condensed Matter - Mesoscale and Nanoscale Physics FOS: Physical sciences Charge (physics) Condensed Matter Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Ferromagnetic resonance Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Ferromagnetism Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Dissipative system Condensed Matter::Strongly Correlated Electrons Boundary value problem Spin (physics) |
| Popis: | We present a phenomenological theory of spin-orbit torques in a metallic ferromagnet with spin-relaxing boundaries. The model is rooted in the coupled diffusion of charge and spin in the bulk of the ferromagnet, where we account for the anomalous Hall effects as well as the anisotropic magnetoresistance in the corresponding constitutive relations for both charge and spin sectors. The diffusion equations are supplemented with suitable boundary conditions reflecting the spin-sink capacity of the environment. In inversion-asymmetric heterostructures, the uncompensated spin accumulation exerts a dissipative torque on the order parameter, giving rise to a current-dependent linewidth in the ferromagnetic resonance with a characteristic angular dependence. We compare our model to recent spin-torque ferromagnetic resonance measurements, illustrating how rich self-induced spin-torque phenomenology can arise even in simple magnetic structures. 7 pages, 2 figures |
| Databáze: | OpenAIRE |
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