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Título
Asynchronous current-induced switching of rare-earth and transition-metal sublattices in ferrimagnetic alloys
Autor(es)
Palabras clave
Magnetism
Computational physics
Fecha de publicación
2022
Resumen
Ferrimagnetic alloys are model systems for understanding the ultrafast magnetization switching in materials with antiferromagnetically-coupled sublattices. Here we investigate the dynamics of the rare-earth and transition-metal sublattices in ferrimagnetic GdFeCo and TbCo dots excited by spin-orbit torques with combined temporal, spatial, and elemental resolution. We observe distinct switching regimes in which the magnetizations of the two sublattices either remain syn-6
chronized throughout the reversal process or switch following different trajectories in time and space. In the latter case, we observe a transient ferromagnetic state that lasts up to 2 ns. The asynchronous switching of the two magnetizations is ascribed to the master-agent dynamics induced by the spin-orbit torques in combination with the weak antiferromagnetic coupling, which depends sensitively on the microstructure of ferrimagnets. A larger antiferromagnetic exchange between the two sublattices leads to faster switching and shorter recovery of the magnetization after a current pulse.
URI
ISSN
1476-1122
DOI
10.1038/s41563-022-01248-8
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