Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 49, Issue 7, Pages 3159-3162Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2013.2239269
Keywords
Gilbert damping; time-resolved magneto-optical Kerr effect (TRMOKE); ultrafast spin dynamics; TbFeCo films
Funding
- National Natural Science Foundation of China [2012CB933101, 2009CB929201, 51201081, 11104122]
- Gansu province science and technology funding [1208RJYA007, 1208RJYA008]
- Central Universities [lzujbky-2010-172, lzujbky-2011-59, lzujbky-2011-51]
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Ultrafast spin dynamics in Tb-x(FeCo)(1-x) films is studied using the time-resolved magneto-optical Kerr effect. At pump fluence of 1.0 mJ/cm(2) the ultrafast demagnetization processes are accomplished by one-step and two-step decays (the first fast and second slow decays) for low and high Tb contents, respectively. For the low Tb contents, the demagnetization time is almost a constant (similar to 600 fs), which is similar with the demagnetization time (tau(1)) of the first fast decay for the high Tb contents due to bleaching effect. However, the following slow demagnetization time (tau(2)) for the high Tb contents strongly depends on the Tb contents. It increases with increasing Tb contents, and reaches a maximum of 3.0 ps at x = 0.21, then decreases with Tb content further increasing. The distinguished slow decay process is suggested to ascribe to the Gilbert damping factor.
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