Antiferromagnetic Domain Wall Motion Driven by Spin-Orbit Torques

We theoretically investigate the dynamics of antiferromagnetic domain walls driven by spin-orbit torques in antiferromagnet-heavy-metal bilayers. We show that spin-orbit torques drive antiferromagnetic domain walls much faster than ferromagnetic domain walls. As the domain wall velocity approaches t...

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Bibliographic Details
Published in:	Physical review letters Vol. 117; no. 8; p. 087203
Main Authors:	Shiino, Takayuki, Oh, Se-Hyeok, Haney, Paul M, Lee, Seo-Won, Go, Gyungchoon, Park, Byong-Guk, Lee, Kyung-Jin
Format:	Journal Article
Language:	English
Published:	United States 16-08-2016
Subjects:	Antiferromagnetism Domain walls Dynamic tests Dynamics Spin waves Surface layer Terahertz frequencies Texture
Online Access:	Get full text
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Summary:	We theoretically investigate the dynamics of antiferromagnetic domain walls driven by spin-orbit torques in antiferromagnet-heavy-metal bilayers. We show that spin-orbit torques drive antiferromagnetic domain walls much faster than ferromagnetic domain walls. As the domain wall velocity approaches the maximum spin-wave group velocity, the domain wall undergoes Lorentz contraction and emits spin waves in the terahertz frequency range. The interplay between spin-orbit torques and the relativistic dynamics of antiferromagnetic domain walls leads to the efficient manipulation of antiferromagnetic spin textures and paves the way for the generation of high frequency signals from antiferromagnets.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 These two authors contributed equally to this work.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.117.087203