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Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor

Ramsay, A.J.; Roy, P.E.; Haigh, J.A.; Otxoa, R.M.; Irvine, A.C.; Janda, T.; Campion, R.P.; Gallagher, B.L.; Wunderlich, J.


A.J. Ramsay

P.E. Roy

J.A. Haigh

R.M. Otxoa

A.C. Irvine

T. Janda

R.P. Campion

B.L. Gallagher

J. Wunderlich


We demonstrate optical manipulation of the position of a domain wall in a dilute magnetic semiconductor,GaMnAsP. Two main contributions are identified. First, photocarrier spin exerts a spin-transfer torque on the magnetization via the exchange interaction. The direction of the domain-wall motion can be controlled using the helicity of the laser. Second, the domain wall is attracted to the hot spot generated by the focused laser. Unlike magnetic-field-driven domain-wall depinning, these mechanisms directly drive domain-wall motion, providing an optical tweezerlike ability to position and locally probe domain walls.


Ramsay, A., Roy, P., Haigh, J., Otxoa, R., Irvine, A., Janda, T., …Wunderlich, J. (2015). Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor. Physical Review Letters, 114(6), Article 067202.

Journal Article Type Article
Acceptance Date Jan 13, 2015
Online Publication Date Feb 11, 2015
Publication Date Feb 13, 2015
Deposit Date Aug 8, 2016
Publicly Available Date Aug 8, 2016
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 114
Issue 6
Article Number 067202
Public URL
Publisher URL


PhysRevLett.114.067202.pdf (513 Kb)

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