Magnetization and microstructure dynamics in Fe/MnAs/GaAs(001): Fe magnetization reversal by a femtosecond laser pulse.
Magnetization and microstructure dynamics in Fe/MnAs/GaAs(001): Fe magnetization reversal by a femtosecond laser pulse.
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DOI：
10.1103/physrevlett.113.247202
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发表时间：
2014-12
影响因子：
8.6
通讯作者：
C. Spezzani;E. Ferrari;E. Allaria;F. Vidal;A. Ciavardini;R. Delaunay;F. Capotondi;E. Pedersoli
中科院分区：
文献类型：
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作者：
C. Spezzani;E. Ferrari;E. Allaria;F. Vidal;A. Ciavardini;R. Delaunay;F. Capotondi;E. Pedersoli
不施加外场的薄膜磁化反转在传感器和器件中的应用是一个有吸引力的前景。实现它的一种方法是通过温度控制微调磁性衬底的微结构，如在MnAs/GaAs（001）模板上沉积的薄Fe层的情况。这项工作报告的时间分辨共振散射研究探索的Fe/MnAs系统的磁性和结构特性，使用100 fs的光激光脉冲，以触发局部温度变化和100 fs的X射线自由电子激光脉冲探测感应的磁性和结构动力学。实验结果为单脉冲激光可以局部反转Fe的磁化提供了直接证据。它揭示了磁化反转的时间尺度比由光脉冲触发的MnAs结构转变的时间尺度慢，所述结构转变在几皮秒之后已经发生。
Thin film magnetization reversal without applying external fields is an attractive perspective for applications in sensors and devices. One way to accomplish it is by fine-tuning the microstructure of a magnetic substrate via temperature control, as in the case of a thin Fe layer deposited on a MnAs/GaAs(001) template. This work reports a time-resolved resonant scattering study exploring the magnetic and structural properties of the Fe/MnAs system, using a 100 fs optical laser pulse to trigger local temperature variations and a 100 fs x-ray free-electron laser pulse to probe the induced magnetic and structural dynamics. The experiment provides direct evidence that a single optical laser pulse can reverse the Fe magnetization locally. It reveals that the time scale of the magnetization reversal is slower than that of the MnAs structural transformations triggered by the optical pulse, which take place after a few picoseconds already.