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Ramsay, A.J. and Roy, P.E. and Haigh, J.A. and Otxoa, R.M. and Irvine, A.C. and Janda, T. and Campion, R.P. and Gallagher, B.L. and Wunderlich, J. (2015) Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor. Physical Review Letters, 114 (6). 067202. ISSN 0031-9007

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.

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