Phys. Rev. B 97, 094401 (2018) - Self-consistent study of local and nonlocal magnetoresistance in a YIG/Pt bilayer

Self-consistent study of local and nonlocal magnetoresistance in a YIG/Pt bilayer

Xi-guang Wang, Zhen-wei Zhou, Yao-zhuang Nie, Qing-lin Xia, and Guang-hua Guo

Phys. Rev. B 97, 094401 – Published 1 March 2018

Abstract

We present a self-consistent study of the local spin Hall magnetoresistance (SMR) and nonlocal magnon-mediated magnetoresistance (MMR) in a heavy-metal/magnetic-insulator heterostructure at finite temperature. We find that the thermal fluctuation of magnetization significantly affects the SMR. It appears unidirectional with respect to the direction of electrical current (or magnetization). The unidirectionality of SMR originates from the asymmetry of creation or annihilation of thermal magnons induced by the spin Hall torque. Also, a self-consistent model can well describe the features of MMR.

Received 11 December 2017
Revised 21 February 2018

DOI:https://doi.org/10.1103/PhysRevB.97.094401

©2018 American Physical Society

Physics Subject Headings (PhySH)

Micromagnetism Spin Hall magnetoresistance Spin current Spin pumping Spin transfer torque Spin waves

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Xi-guang Wang, Zhen-wei Zhou, Yao-zhuang Nie, Qing-lin Xia, and Guang-hua Guo^*

School of Physics and Electronics, Central South University, Changsha, 410083, China

^*guogh@mail.csu.edu.cn

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Issue

Vol. 97, Iss. 9 — 1 March 2018

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