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Hot electron driven enhancement of spin-lattice coupling in 4f ferromagnets observed by femtosecond x-ray magnetic circular dichroism
Preprint
Marko Wietstruk ,
Alexey Melnikov ,
Christian Stamm ,
Torsten Kachel ,
Niko Pontius ,
Muhammad Sultan ,
Cornelius Gahl ,
Martin Weinelt ,
Hermann A. Dürr ,
Uwe Bovensiepen
2010-10-07
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Abstract
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.