Physics – Condensed Matter – Materials Science
Scientific paper
2010-10-07
Physics
Condensed Matter
Materials Science
added reference 24, clarified the meaning of photo-induced, emphasized that XMCD probes the magnetic moment localized at 4f el
Scientific paper
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.
Bovensiepen Uwe
Dürr Hermann A.
Gahl Cornelius
Kachel Torsten
Melnikov Alexey
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