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Ultrafast Time-Resolved Faraday Rotation in EuO Thin Films

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arxiv 1205.2818 v2 pith:RDCWJM6V submitted 2012-05-12 cond-mat.mtrl-sci

F. Liu , T. Makino , T. Yamazaki , K. Ueno , A. Tsukazaki , T. Fukumura , Y. Kong , M. Kawasaki This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords enhancementmagnetizationdemagnetizationfaradayfilmsrotationthintime-resolved
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We have investigated the ultrafast spin dynamics in EuO thin films by time-resolved Faraday rotation spectroscopy. The photoinduced magnetization is found to be increased in a transient manner, accompanied with subsequent demagnetization. The dynamical magnetization enhancement showed a maximum slightly below the Curie temperature with prolonged tails toward both lower and higher temperatures and dominates the demagnetization counterpart at 55 K. The magnetization enhancement component decays in ~1 ns. The realization of the transient collective ordering is attributable to the enhancement of the f-d exchange interaction.

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