Ultrafast Magnetism of a Ferrimagnet across the Spin-Flop Transition in High Magnetic Fields.
نویسندگان
چکیده
We show that applying magnetic fields up to 30 T has a dramatic effect on the ultrafast spin dynamics in ferrimagnetic GdFeCo. Upon increasing the field beyond a critical value, the dynamics induced by a femtosecond laser excitation strongly increases in amplitude and slows down significantly. Such a change in spin response is explained by different dynamics of the Gd and FeCo magnetic sublattices following a spin-flop phase transition from a collinear to a noncollinear spin state.
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عنوان ژورنال:
- Physical review letters
دوره 118 11 شماره
صفحات -
تاریخ انتشار 2017