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. 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

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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.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/745155
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: https://doi.org/10.1103/PhysRevLett.114.067202
Depositing User: Gallagher, Bryan
Date Deposited: 08 Aug 2016 12:49
Last Modified: 04 May 2020 17:02
URI: https://eprints.nottingham.ac.uk/id/eprint/35705

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