Optical spin transfer torque driven domain wall motion in ferromagnetic semiconductor
Mesoscale and Nanoscale Physics
2015-03-06 v2 Materials Science
Abstract
We demonstrate optical manipulation of the position of a domain wall in a dilute magnetic semiconductor, GaMnAsP. Two main contributions are identified. Firstly, 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. Secondly, 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 tweezer like ability to position and locally probe domain walls.
Cite
@article{arxiv.1409.6223,
title = {Optical spin transfer torque driven domain wall motion in ferromagnetic semiconductor},
author = {A. J. Ramsay and P. E. Roy and J. A. Haigh and R. M. Otxoa and A. C. Irvine and T. Janda and R. P. Campion and B. L. Gallagher and J. Wunderlich},
journal= {arXiv preprint arXiv:1409.6223},
year = {2015}
}
Comments
5 pages, 4 figs, final version improved by referee feedback