2014/09/30 by A. J. Ramsay, P. E. Roy, J. A. Haigh +7
Engineering · Physics and Astronomy · #Condensed matter physics #Domain (mathematical analysis) #Domain wall (magnetism) #Ferromagnetism #Field (mathematics) #Helicity #Magnetic domain #Magnetic field #Magnetic properties of thin films #Magnetization #Magneto-Optical Properties and Applications #Materials science #Optoelectronics #Physics #Position (finance) #Quantum mechanics #Semiconductor #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #Torque #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.114.067202
published as Phys. Rev. Lett. 114 067202 (2015) · 5 pages, 4 figs, final version improved by referee feedback
openalex publication_date 2015/02/11 · arxiv created 2015/03/05 · arxiv updated 2015/03/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.