Ultrafast spin transport as key to femtosecond demagnetization (original) (raw)

AI-generated Abstract

Ultrafast demagnetization in ferromagnetic materials is typically understood to result from direct laser excitation. This research presents an alternative explanation, demonstrating that the rapid demagnetization observed can be attributed to the transport of non-spin-polarized hot electrons generated in a capping layer, rather than direct absorption by the ferromagnetic layer itself. Using femtosecond laser pulses on Au/Ni layered structures, the authors reveal how electron cascades facilitate demagnetization, suggesting that superdiffusive transport of these electrons plays a key role in ultrafast demagnetization processes.

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