Competing spin transfer and dissipation at Co/Cu(001) interfaces on femtosecond timescales
arXiv:1803.03090 · doi:10.1103/PhysRevLett.122.067202
Abstract
By combining interface-sensitive non-linear magneto-optical experiments with femtosecond time resolution and ab-initio time-dependent density functional theory, we show that optically excited spin dynamics at Co/Cu(001) interfaces proceeds via spin-dependent charge transfer and backtransfer between Co and Cu. This ultrafast spin transfer competes with dissipation of spin angular momentum mediated by spin-orbit coupling already on sub 100 fs timescales. We thereby identify the fundamental microscopic processes during laser-induced spin transfer at a model interface for technologically relevant ferromagnetic heterostructures.
arXiv comment5 pages, 4 figures
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