Walker Breakdown with a Twist: Dynamics of Multilayer Domain Walls and Skyrmions Driven by Spin-Orbit Torque
Name
PhysRevApplied.12.044031.pdf
Description
Published version
Size
3.11 MB
Format
Adobe PDF
Checksum (MD5)
583b9e6d39b936ae691c496274cd2df3
Author(s)
Lemesh, Ivan
Beach, Geoffrey Stephen
Date Issued
October 2019
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PHYSREVAPPLIED.12.044031
