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首页> 外文期刊>Physical review >Role of magnetic anisotropy in the ultrafast magnetization dynamics of Gd-Fe thin films of different thicknesses
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Role of magnetic anisotropy in the ultrafast magnetization dynamics of Gd-Fe thin films of different thicknesses

机译：磁各向异性在不同厚度的Gd-Fe薄膜超快磁化动力学中的作用

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摘要

The time-resolved magneto-optical Kerr effect technique has been exploited to study the magnetization dynamics over femtosecond to nanosecond timescale for Gd-Fe thin films with different thicknesses. The precessional magnetization dynamics is studied by varying the magnitude and orientation of the bias magnetic field from nearly in-plane to nearly out-of-plane (OOP) direction. The analysis of bias magnetic field dependence of precessional frequency has revealed the development of OOP anisotropy when the film thickness was increased from 20 to 100 nm and this is in good agreement with the static magnetic properties of the films. Moreover, the 100-nm-thick film has shown a signature of perpendicular standing spin wave modes along with the uniform Kittel mode. The evolution of their frequency, decay time, and damping with the magnitude and orientation of bias magnetic field is analyzed in detail, showing possible energy transfer between the perpendicular standing spin wave modes and the uniform Kittel mode. Interestingly, the effective damping could be tuned over a broader range of 0.02 to 0.15, which shows the potential for applications in miniaturized and fast magnetic storage, magnetic memory, and magnonic devices.
机译：时间分辨磁光克尔效应技术已被用来研究不同厚度的Gd-Fe薄膜在飞秒到纳秒级的磁化动力学。通过改变偏置磁场的大小和方向（从近平面方向到近平面方向），可以研究进动磁化动力学。对进动频率的偏磁场依赖性的分析揭示了当膜厚度从20 nm增加到100 nm时OOP各向异性的发展，这与膜的静磁特性非常吻合。此外，厚度为100 nm的薄膜已显示出垂直站立的自旋波模式以及均匀的Kittel模式。详细分析了它们的频率，衰减时间和阻尼随偏磁场的大小和方向的变化，显示了垂直驻波模式和均匀Kittel模式之间可能的能量转移。有趣的是，有效阻尼可以在0.02到0.15的较宽范围内进行调整，这显示了在小型化和快速磁存储，磁存储器和大型电子设备中应用的潜力。

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