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An antidamping spin–orbit torque originating from the Berry curvature

Kurebayashi, H.; Sinova, Jairo; Fang, D.; Irvine, A. C.; Skinner, T. D.; Wunderlich, J.; Novák, V.; Campion, R. P.; Gallagher, B. L.; Vehstedt, E. K.; Zârbo, L. P.; Výborný, K.; Ferguson, A. J.; Jungwirth, T.

Authors

H. Kurebayashi

Jairo Sinova

D. Fang

A. C. Irvine

T. D. Skinner

J. Wunderlich

V. Novák

R. P. Campion

B. L. Gallagher

E. K. Vehstedt

L. P. Zârbo

K. Výborný

A. J. Ferguson

T. Jungwirth



Abstract

Magnetization switching at the interface between ferromagnetic and paramagnetic metals, controlled by current-induced torques, could be exploited in magnetic memory technologies. Compelling questions arise regarding the role played in the switching by the spin Hall effect in the paramagnet and by the spin–orbit torque originating from the broken inversion symmetry at the interface. Of particular importance are the antidamping components of these current-induced torques acting against the equilibrium-restoring Gilbert damping of the magnetization dynamics. Here, we report the observation of an antidamping spin–orbit torque that stems from the Berry curvature, in analogy to the origin of the intrinsic spin Hall effect. We chose the ferromagnetic semiconductor (Ga,Mn)As as a material system because its crystal inversion asymmetry allows us to measure bare ferromagnetic films, rather than ferromagnetic paramagnetic heterostructures,eliminating by design any spin Hall effect contribution. We provide an intuitive picture of the Berry curvature origin of this antidamping spin–orbit torque as well as its microscopic modelling. We expect the Berry curvature spin–orbit torque to be of comparable strength to the spin-Hall effect-driven antidamping torque in ferromagnets interfaced with paramagnets with strong intrinsic spin Hall effect.

Journal Article Type Article
Publication Date 2014-03
Journal Nature Nanotechnology
Print ISSN 1748-3387
Electronic ISSN 1748-3395
Publisher Nature Publishing Group
Peer Reviewed Not Peer Reviewed
Volume 9
Issue 3
Pages 211-217
APA6 Citation Kurebayashi, H., Sinova, J., Fang, D., Irvine, A. C., Skinner, T. D., Wunderlich, J., …Jungwirth, T. (2014). An antidamping spin–orbit torque originating from the Berry curvature. Nature Nanotechnology, 9(3), 211-217. https://doi.org/10.1038/nnano.2014.15
DOI https://doi.org/10.1038/nnano.2014.15
Keywords magnetic devices
Publisher URL http://www.nature.com/nnano/journal/v9/n3/full/nnano.2014.15.html
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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