Dynamical and current-induced Dzyaloshinskii-Moriya interaction: Role for damping, gyromagnetism, and current-induced torques in noncollinear magnets
Freimuth F, Bluegel S, Mokrousov Y (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 102
Article Number: 245411
Journal Issue: 24
DOI: 10.1103/PhysRevB.102.245411
Abstract
Both applied electric currents and magnetization dynamics modify the Dzyaloshinskii-Moriya interaction (DMI), which we call current-induced DMI (CIDMI) and dynamical DMI (DDMI), respectively. We report a theory of CIDMI and DDMI. The inverse of CIDMI consists in charge pumping by a time-dependent gradient of magnetization ∂2M(r,t)/∂r∂t, while the inverse of DDMI describes the torque generated by ∂2M(r,t)/∂r∂t. In noncollinear magnets, CIDMI and DDMI depend on the local magnetization direction. The resulting spatial gradients correspond to torques that need to be included into the theories of Gilbert damping, gyromagnetism, and current-induced torques (CITs) in order to satisfy the Onsager reciprocity relations. CIDMI is related to the modification of orbital magnetism induced by magnetization dynamics, which we call dynamical orbital magnetism (DOM), and spatial gradients of DOM contribute to charge pumping. We present applications of this formalism to the CITs and to the torque-torque correlation in textured Rashba ferromagnets.
Involved external institutions
Germany (DE)How to cite
APA:
Freimuth, F., Bluegel, S., & Mokrousov, Y. (2020). Dynamical and current-induced Dzyaloshinskii-Moriya interaction: Role for damping, gyromagnetism, and current-induced torques in noncollinear magnets. Physical Review B, 102(24). https://doi.org/10.1103/PhysRevB.102.245411
MLA:
Freimuth, Frank, Stefan Bluegel, and Yuriy Mokrousov. "Dynamical and current-induced Dzyaloshinskii-Moriya interaction: Role for damping, gyromagnetism, and current-induced torques in noncollinear magnets." Physical Review B 102.24 (2020).
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