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Many-body theory of ultrafast demagnetization and angular momentum transfer in ferromagnetic transition metals

Exact calculated time evolutions in the framework of a many-electron model of itinerant magnetism provide new insights into the laser-induced ultrafast demagnetization observed in ferromagnetic (FM) transition metal thin films. The interplay between local spin-orbit interactions and interatomic hopping is shown to be at the origin of the observed post-excitation breakdown of FM correlations between highly stable local magnetic moments. The mechanism behind spin- and angular-momentum transfer is revealed from a microscopic perspective by rigorously complying with all fundamental conservation laws. An energy-resolved analysis of the time evolution shows that the efficiency of the demagnetization process reaches almost 100% in the excited states.

preprint2015arXivOpen access
W. TöwsG. M. Pastor
cond-mat.str-elcond-mat.mtrl-sci
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W. TöwsG. M. Pastor

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