Ultrafast magnetization relaxation of L1(0)-ordered Fe50Pt50 alloy thin film

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We have investigated the ultrafast magnetization dynamics of L1(0)-ordered Fe50Pt50 thin film by means of a time-resolved magneto-optical Kerr effect measurement. We have found a high Gilbert damping value of alpha similar to 0.26, together with a very high precession frequency of f similar to 85 GHz and the shortest relaxation characteristic time of tau similar to 6.5 ps ever reported. We believe that L1(0)-ordered FePt film with the unique property of a very high precession frequency and the shortest relaxation time will be very useful for the realization of picosecond spin switching. (C) 2011 American Institute of Physics. [doi:10.1063/1.3559845]
Publisher
AMER INST PHYSICS
Issue Date
2011-02
Language
English
Article Type
Article
Keywords

FEPT; DYNAMICS

Citation

APPLIED PHYSICS LETTERS, v.98, no.9

ISSN
0003-6951
DOI
10.1063/1.3559845
URI
http://hdl.handle.net/10203/96976
Appears in Collection
RIMS Journal Papers
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