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Current-induced motion of a transverse magnetic domain wall in the presence of spin Hall effect

Published

Author(s)

Soo-Man Seo, Kyoung-Whan Kim, Jisu Ryu, Hyun-Woo Lee, Kyung Jin Lee

Abstract

We study theoretically current-induced dynamics of a transverse magnetic domain wall in bi-layer nanowires consisting of a ferromagnet on top of a nonmagnet having strong spin-orbit coupling. Domain wall dynamics is characterized by two threshold current densities, J_th^WB and J_th^REV, where J_th^WB is a threshold for the chirality switching of the domain wall and J_th^REV is another threshold for the reversed domain wall motion caused by spin Hall effect. The domain wall with a certain chirality may move opposite to the electron-flow direction with high speed in the current range J_th^REV < J < J_th^WB for the system designed to satisfy the conditions J_th^REV < J_th^WB and \alpha > \beta where \alpha is the Gilbert damping constant and \beta is the nonadiabaticity of spin torque. Micromagnetic simulations confirm the validity of analytical results.
Citation
Applied Physics Letters
Volume
101
Issue
2

Keywords

spin-transfer torque, domain wall motion, spin Hall effect

Citation

Seo, S. , Kim, K. , Ryu, J. , Lee, H. and Lee, K. (2012), Current-induced motion of a transverse magnetic domain wall in the presence of spin Hall effect, Applied Physics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910563 (Accessed April 23, 2024)
Created July 8, 2012, Updated October 12, 2021