Ultrafast nonequilibrium spin dynamics in a ferromagnetic thin film
نویسندگان
چکیده
An ultrafast time-resolved magneto-optical pump probe is applied to study spin-relaxation processes in a ferromagnetic CoPt3 alloy film. Following spin-selective photoexcitation with circularly polarized femtosecond pulses, transient Kerr ellipticity tracks the evolution of the nonequilibrium spin system. We isolate two distinct processes: a subpicosecond component due to the relaxation of coherently spin polarized electrons, and a slower component ~;10 psec! associated with the evolution of the thermalized spin distribution and the photoinduced transient magnetization. @S0163-1829~98!50702-3#
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تاریخ انتشار 1997