Gilbert damping and critical real-space trajectory of L1(0)-ordered FePt films investigated by magnetic-field-induction and all-optical methods

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The magnetization dynamics of perpendicularly magnetized FePt films is studied using both magnetic-field-induction and all-optical methods. A critically damped trajectory was observed in this system, where the precession ended within subnanoseconds after a single large oscillation. Using the Landau-Lifshitz-Gilbert (LLG) calculation with an experimental configuration, the effective anisotropy and damping constant were obtained. A damping constant of approximately 0.2 was determined after both a magnetic field and a laser pulse were used. The laser-induced real-space trajectory was well explained by the modified LLG calculation taking into account the demagnetization and time-dependent anisotropy.
Publisher
IOP PUBLISHING LTD
Issue Date
2014-11
Language
English
Article Type
Article
Keywords

ULTRAFAST SPIN DYNAMICS; NANOPARTICLES; MICROSCOPY; REVERSAL

Citation

APPLIED PHYSICS EXPRESS, v.7, no.11

ISSN
1882-0778
DOI
10.7567/APEX.7.113004
URI
http://hdl.handle.net/10203/201080
Appears in Collection
MS-Journal Papers(저널논문)RIMS Journal Papers
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