Ultrafast laser-induced magnetization precession dynamics in FePt/CoFe exchange-coupled films

Zongzhi Zhang, Boyin Cui, Guangzhong Wang, B. Ma, Q. Y. Jin, Yaowen Liu

Research output: Contribution to journalArticlepeer-review

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Femtosecond laser-triggered magnetization precession dynamics in exchange-coupled hard FePt/soft CoFe films has been studied by the time-resolved magneto-optical Kerr effect. The precession frequency is shown to be independent of the CoFe thickness tCoFe, while linearly proportional to the external field for the sample with tCoFe =7 nm, implying that the magnetization relaxation is governed by a uniform precession mode. The result agrees well with the theoretical prediction based on the Landau-Lifshitz-Gilbert equation. The obtained damping factor α∼0.13 is quite large and is thought to be dominated by the FePt layer. Additionally, the oscillation amplitude strongly depends on the CoFe thickness with a maximum value occurred at tCoFe =7 nm.

Original languageEnglish (US)
Article number172508
JournalApplied Physics Letters
Issue number17
StatePublished - Oct 25 2010

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