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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.

Authors

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



Abstract

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.

Journal Article Type Article
Publication Date Feb 13, 2015
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
APA6 Citation 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), https://doi.org/10.1103/PhysRevLett.114.067202
DOI https://doi.org/10.1103/PhysRevLett.114.067202
Publisher URL http://dx.doi.org/10.1103/PhysRevLett.114.067202
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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PhysRevLett.114.067202.pdf (513 Kb)
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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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