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Spin Current$
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Sadamichi Maekawa, Sergio O. Valenzuela, Eiji Saitoh, and Takashi Kimura

Print publication date: 2017

Print ISBN-13: 9780198787075

Published to Oxford Scholarship Online: December 2017

DOI: 10.1093/oso/9780198787075.001.0001

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Theory of Rashba Torques

Theory of Rashba Torques

(p.475) 24 Theory of Rashba Torques
Spin Current

A. Manchon

S. Zhang

Oxford University Press

This chapter focuses on the theory of current-driven Rashba torque, a special type of spin–orbit mediated spin torque that requires broken spatial-inversion symmetry. This specific form of spin-orbit interaction enables the electrical generation of a non-equilibrium spin density that yields both damping-like and field-like torques on the local magnetic moments. We review the recent results obtained in (ferromagnetic and antiferromagnetic) two-dimensional electron gases, bulk magnetic semiconductors, and at the surface of topological insulators. We conclude by summarizing recent experimental results that support the emergence of Rashba torques in magnets lacking inversion symmetry.

Keywords:   spin-orbit interaction, rashba field, spatial-inversion symmetry, semiconductor quantum wells, gate voltage, intrinsic band mismatch, topological insulators

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