@article { , title = {Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor}, 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.}, doi = {10.1103/PhysRevLett.114.067202}, eissn = {1079-7114}, issn = {0031-9007}, issue = {6}, journal = {Physical Review Letters}, publicationstatus = {Published}, publisher = {American Physical Society}, url = {https://nottingham-repository.worktribe.com/output/745155}, volume = {114}, year = {2015}, author = {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.} }