Enhancement of spin Hall effect induced torques for current-driven magnetic domain wall motion: Inner interface effect

Do Bang, Jiawei Yu, Xuepeng Qiu, Yi Wang, Hiroyuki Awano, Aurelien Manchon, and Hyunsoo Yang
Phys. Rev. B 93, 174424 – Published 23 May 2016

Abstract

We investigate the current-induced domain wall motion in perpendicular magnetized Tb/Co wires with structure inversion asymmetry and different layered structures. We find that the critical current density to drive domain wall motion strongly depends on the layered structure. The lowest critical current density 15MA/cm2 and the highest slope of domain wall velocity curve are obtained for the wire having thin Co sublayers and more inner Tb/Co interfaces, while the largest critical current density 26MA/cm2 required to drive domain walls is observed in the Tb-Co alloy magnetic wire. It is found that the Co/Tb interface contributes negligibly to Dzyaloshinskii-Moriya interaction, while the effective spin-orbit torque strongly depends on the number of Tb/Co inner interfaces (n). An enhancement of the antidamping torques by extrinsic spin Hall effect due to Tb rare-earth impurity-induced skew scattering is suggested to explain the high efficiency of current-induced domain wall motion.

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  • Received 3 February 2015
  • Revised 31 March 2016

DOI:https://doi.org/10.1103/PhysRevB.93.174424

©2016 American Physical Society

Authors & Affiliations

Do Bang1,2, Jiawei Yu3, Xuepeng Qiu3, Yi Wang3, Hiroyuki Awano1, Aurelien Manchon4, and Hyunsoo Yang3

  • 1Toyota Technological Institute, Tempaku, Nagoya 468-8511, Japan
  • 2Institute of Material Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
  • 3Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore
  • 4Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia

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Issue

Vol. 93, Iss. 17 — 1 May 2016

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