Self-induced spin-orbit torques in metallic ferromagnets

Abstract

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.

arXiv comment7 pages, 2 figures

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Cited by in corpus (6)

• A Perspective on Electrical Generation of Spin Current for Magnetic Random Access Memories
• Anomalous sign inversion of spin-orbit torque in ferromagnetic/nonmagnetic bilayer systems due to self-induced spin-orbit torque
• Observation of gigantic spin conversion anisotropy in bismuth
• Tunable spin and orbital torques in Cu-based magnetic heterostructures
• Ferrimagnet GdFeCo characterization for spin-orbitronics: large field-like and damping-like torques
• Spin current symmetries generated by GdFeCo ferrimagnet across its magnetisation compensation temperature