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Hot electron driven enhancement of spin-lattice coupling in 4f ferromagnets observed by femtosecond x-ray magnetic circular dichroism

Femtosecond x-ray magnetic circular dichroism was used to study the time-dependent magnetic moment of 4 fs electrons in the ferromagnets Gd and Tb, which are known for their different spin-lattice coupling. We observe a two-step demagnetization with an ultrafast demagnetization time of 750 fs identical for both systems and slower times which differ sizeably with 40 ps for Gd and 8 ps for Tb. We conclude that spin-lattice coupling in the electronically excited state is enhanced up to orders of magnitude compared to equilibrium.

preprint2011arXivOpen access
Marko WietstrukAlexey MelnikovChristian StammTorsten KachelNiko PontiusMuhammad SultanCornelius GahlMartin WeineltHermann A. DürrUwe Bovensiepen
cond-mat.mtrl-sci
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Open access10 authors1 topic
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Marko WietstrukAlexey MelnikovChristian StammTorsten KachelNiko PontiusMuhammad SultanCornelius GahlMartin WeineltHermann A. DürrUwe Bovensiepen

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