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We demonstrate optical manipulation of the position of a domain wall in adilute magnetic semiconductor, GaMnAsP. Two main contributions are identified.Firstly, photocarrier spin exerts a spin transfer torque on the magnetizationvia the exchange interaction. The direction of the domain wall motion can becontrolled using the helicity of the laser. Secondly, the domain wall isattracted to the hot-spot generated by the focused laser. Unlike magnetic fielddriven domain wall depinning, these mechanisms directly drive domain wallmotion, providing an optical tweezer like ability to position and locally probedomain walls.

Optical spin transfer torque driven domain wall motion in ferromagnetic semiconductor