2026-09-14T14:42:09Zhttps://gredos.usal.es/oai/request

oai:gredos.usal.es:10366/1531372025-04-30T20:46:05Zcom_10366_138184com_10366_4512com_10366_3823col_10366_138185

Sala, Giacomo Lambert, Charles-Henri Finizio, Simone Raposo Funcia, Víctor Javier Krizakova, Viola Krishnaswamy, Gunasheel Weigand, Markus Raabe, Jorg Rossell, Marta D. Martínez Vecino, Eduardo Gambardella, Pietro 2023-10-03T11:55:46Z 2023-10-03T11:55:46Z 2022 1476-1122 http://hdl.handle.net/10366/153137 10.1038/s41563-022-01248-8 1476-4660 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. eng info:eu-repo/semantics/openAccess Magnetism Computational physics Asynchronous current-induced switching of rare-earth and transition-metal sublattices in ferrimagnetic alloys info:eu-repo/semantics/article