Walker Breakdown with a Twist: Dynamics of Multilayer Domain Walls and Skyrmions Driven by Spin-Orbit Torque
Author(s)
Lemesh, Ivan; Beach, Geoffrey Stephen
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Current-induced dynamics of twisted domain walls and skyrmions in ferromagnetic perpendicularly magnetized multilayers is studied through three-dimensional micromagnetic simulations and analytical modeling. It is shown that such systems generally exhibit a Walker-breakdown-like phenomenon in the presence of a current-induced dampinglike spin-orbit torque. Above a critical current threshold, corresponding to typical velocities of the order of tens of m/s, domain walls in some layers start to precess with frequencies in the gigahertz regime, which leads to oscillatory motion and a significant drop in mobility. This phenomenon originates from complex stray field interactions and occurs for a wide range of multilayer materials and structures that include at least three ferromagnetic layers and finite Dzyaloshinskii-Moriya interaction. An analytical model is developed to describe the precessional dynamics in multilayers with surface-volume stray field interactions, yielding qualitative agreement with micromagnetic simulations.
Date issued
2019-10Department
Massachusetts Institute of Technology. Department of Materials Science and EngineeringJournal
Physical Review Applied
Publisher
American Physical Society (APS)
Citation
Lemesh, Ivan and Geoffrey S.D. Beach. “Walker Breakdown with a Twist: Dynamics of Multilayer Domain Walls and Skyrmions Driven by Spin-Orbit Torque.” Physical Review Applied, 12, 4 (October 2019): 044031 © 2019 The Author(s)
Version: Final published version
ISSN
2331-7019