Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor
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 ca...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Published: |
American Physical Society
2015
|
| Online Access: | https://eprints.nottingham.ac.uk/35705/ |
| _version_ | 1848795142145703936 |
|---|---|
| author | Ramsay, A.J. Roy, P.E. Haigh, J.A. Otxoa, R.M. Irvine, A.C. Janda, T. Campion, R.P. Gallagher, B.L. Wunderlich, J. |
| author_facet | Ramsay, A.J. Roy, P.E. Haigh, J.A. Otxoa, R.M. Irvine, A.C. Janda, T. Campion, R.P. Gallagher, B.L. Wunderlich, J. |
| author_sort | Ramsay, A.J. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T19:27:23Z |
| format | Article |
| id | nottingham-35705 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:27:23Z |
| publishDate | 2015 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-357052020-05-04T17:02:49Z https://eprints.nottingham.ac.uk/35705/ 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. Wunderlich, J. 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. American Physical Society 2015-02-11 Article PeerReviewed 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 http://dx.doi.org/10.1103/PhysRevLett.114.067202 doi:10.1103/PhysRevLett.114.067202 doi:10.1103/PhysRevLett.114.067202 |
| spellingShingle | Ramsay, A.J. Roy, P.E. Haigh, J.A. Otxoa, R.M. Irvine, A.C. Janda, T. Campion, R.P. Gallagher, B.L. Wunderlich, J. Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor |
| title | Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor |
| title_full | Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor |
| title_fullStr | Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor |
| title_full_unstemmed | Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor |
| title_short | Optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor |
| title_sort | optical spin-transfer-torque-driven domain-wall motion in a ferromagnetic semiconductor |
| url | https://eprints.nottingham.ac.uk/35705/ https://eprints.nottingham.ac.uk/35705/ https://eprints.nottingham.ac.uk/35705/ |