Self-induced spin-orbit torques in metallic ferromagnets

Ochoa, Héctor; Zarzuela, Ricardo; Tserkovnyak, Yaroslav

doi:10.1016/j.jmmm.2021.168262

Self-induced spin-orbit torques in metallic ferromagnets

Journal Article · Sun Jul 04 00:00:00 EDT 2021 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2021.168262· OSTI ID:1977328

Ochoa, Héctor ^[1]; Zarzuela, Ricardo ^[2]; Tserkovnyak, Yaroslav ^[3]

Univ. of California, Los Angeles, CA (United States); Columbia Univ., New York, NY (United States); OSTI
Univ. of California, Los Angeles, CA (United States); Johannes Gutenberg Univ., Mainz (Germany)
Univ. of California, Los Angeles, CA (United States)

Herein 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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012190

OSTI ID:: 1977328

Alternate ID(s):: OSTI ID: 1815164

Journal Information:: Journal of Magnetism and Magnetic Materials, Journal Name: Journal of Magnetism and Magnetic Materials Journal Issue: C Vol. 538; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Materials Science
Physics
Spin transfer
Spin-orbit torques
Spin-torque ferromagnetic resonance
Spintronics

Self-induced spin-orbit torques in metallic ferromagnets

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References (24)

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