Domain wall dynamics due to femtosecond laser-induced superdiffusive spin transport

Abstract

Manipulation of magnetic domain walls via a helicity-independent laser pulse has recently been experimentally demonstrated and various physical mechanisms leading to domain wall dynamics have been discussed. Spin-dependent superdiffusive transport of hot electrons has been identified as one of the possible ways how to affect a magnetic domain wall. Here, we develop a model based on superdiffusive spin-dependent transport to study the laser-induced transport of hot electrons through a smooth magnetic domain wall. We show that the spin transfer between neighboring domains can enhance ultrafast demagnetization in the domain wall. More importantly, our calculations reveal that when the laser pulse is properly focused on to the vicinity of the domain wall, it can excite sufficiently strong spin currents to generate a spin-transfer torque that can rapidly move the magnetic domain wall by several nanometers in several hundreds of femtoseconds, leading to a huge nonequilibrium domain wall velocity.

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Cited by in corpus (7)

• Ultrafast high-harmonic nanoscopy of magnetization dynamics
• Ultrafast demagnetization in ferromagnetic materials: Origins and progress
• Laser-induced torques in metallic antiferromagnets
• Evidence of extreme domain wall speeds under ultrafast optical excitation
• Theory of superdiffusive spin transport in noncollinear magnetic multilayers
• Nonequilibrium dynamics in a spin valve with noncollinear magnetization
• Revealing domain wall stability during ultrafast demagnetization