Optical spin transfer torque driven domain wall motion in ferromagnetic semiconductor

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.

5 pages, 4 figs, final version improved by referee feedback

References in corpus (9)

• Spin Transfer Torques
• Hole-mediated ferromagnetism in tetrahedrally coordinated semiconductors
• Real-space observation of current-driven domain wall motion in submicron magnetic wires
• Domain wall mobility, stability and Walker breakdown in magnetic nanowires
• Experimental observation of the optical spin transfer torque
• Experimental observation of the optical spin-orbit torque
• Systematic study of magnetic linear dichroism and birefringence in (Ga,Mn)As
• Molecular Beam Epitaxy grown (Ga,Mn)(As,P) with perpendicular to plane magnetic easy axis
• Non-thermal photocoercivity effect in a ferromagnetic semiconductor

Cited by in corpus (13)

• Domain wall motion by localized temperature gradients
• Influence of Joule heating on current-induced domain wall depinning
• Inertial displacement of a domain wall excited by ultra-short circularly polarized laser pulses
• Unified theory of magnetization dynamics with relativistic and nonrelativistic spin torques
• Thermally induced spin-transfer torques in superconductor/ferromagnet bilayers
• Thermal gradient driven domain wall dynamics
• Interface-induced field-like optical spin torque in a ferromagnet/heavy metal heterostructure
• Large-scale Monte Carlo simulations for the depinning transition in Ising-type lattice models
• Is perpendicular magnetic anisotropy essential to all-optical ultrafast spin reversal in ferromagnets?
• High-speed antiferromagnetic domain walls driven by coherent spin waves
• Strong ultrafast demagnetization due to the intraband transitions
• Hyperfine-controlled domain-wall motion observed in real space and time
• Nonsteady dynamics at the dynamic depinning transition in the two-dimensional Gaussian random-field Ising model