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

Ultrafast laser-induced magnetization precession dynamics in FePt/CoFe exchange-coupled films
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FePt/CoFe 交换耦合薄膜中超快激光诱导磁化进动动力学

DOI:
10.1063/1.3510473
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发表时间:
2010-10
影响因子:
4
通讯作者:
Cui, Boyin
Cui, Boyin
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ma, B.;Liu, Yaowen;Wang, Guangzhong;Jin, Q. Y.;Zhang, Zongzhi;Cui, Boyin

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利用时间分辨的磁光克尔效应研究了飞秒激光在交换耦合硬FePt/软CoFe薄膜中引发的磁化旋进动力学。旋进频率与CoFe厚度tCoFe无关,而与样品的外场成线性比例(tCoFe=7 nm),这意味着磁化弛豫由均匀的旋进模式控制。 计算结果与基于Landau-Lifshitz-吉尔伯特方程的理论预测结果吻合较好。获得的阻尼因子α = 0.13非常大,并且被认为是由FePt层控制的。此外,振荡幅度强烈地依赖于CoFe的厚度与最大值发生在tCoFe=7 nm。 
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.
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