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High Antiferromagnetic Domain Wall Velocity Induced by Néel Spin-Orbit Torques

Gomonay, O.; Jungwirth, T.; Sinova, Jairo

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Authors

O. Gomonay

TOMAS JUNGWIRTH tomas.jungwirth@nottingham.ac.uk
Research Professor of Ferromagnetic Semiconductors

Jairo Sinova



Abstract

We demonstrate the possibility to drive an antiferromagnetic domain wall at high velocities by fieldlike Néel spin-orbit torques. Such torques arise from current-induced local fields that alternate their orientation on each sublattice of the antiferromagnet and whose orientation depends primarily on the current direction, giving them their fieldlike character. The domain wall velocities that can be achieved by this mechanism are 2 orders of magnitude greater than the ones in ferromagnets. This arises from the efficiency of the staggered spin-orbit fields to couple to the order parameter and from the exchange-enhanced phenomena in
antiferromagnetic texture dynamics, which leads to a low domain wall effective mass and the absence of a Walker breakdown limit. In addition, because of its nature, the staggered spin-orbit field can lift the degeneracy between two 180° rotated states in a collinear antiferromagnet, and it provides a force that can move such walls and control the switching of the states.

Citation

Gomonay, O., Jungwirth, T., & Sinova, J. (2016). High Antiferromagnetic Domain Wall Velocity Induced by Néel Spin-Orbit Torques. Physical Review Letters, 117(1), Article 017202. https://doi.org/10.1103/PhysRevLett.117.017202

Journal Article Type Article
Acceptance Date May 21, 2016
Online Publication Date Jun 29, 2016
Publication Date Jul 1, 2016
Deposit Date Feb 8, 2017
Publicly Available Date Mar 29, 2024
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 117
Issue 1
Article Number 017202
DOI https://doi.org/10.1103/PhysRevLett.117.017202
Public URL https://nottingham-repository.worktribe.com/output/793073
Publisher URL http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.017202

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