Domain wall dynamics due to femtosecond laser-induced superdiffusive spin transport
| Autor: | Karel Carva, Ulrike Ritzmann, Pablo Maldonado, Peter M. Oppeneer, P. Baláž |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed Matter - Mesoscale and Nanoscale Physics Spin transfer torque 500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik Condensed matter physics Magnetic domain Demagnetizing field FOS: Physical sciences Domain walls Laser Pulse (physics) law.invention Domain wall (magnetism) law Ultrafast magnetic effects Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Femtosecond Magnetization dynamics Magnetotransport Magnetic texture Ultrashort pulse Spin-½ |
| Zdroj: | Physical Review B. 101 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.101.174418 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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