Ultrafast optically induced spin transfer in ferromagnetic alloys
Ultrafast optically induced spin transfer in ferromagnetic alloys
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DOI：
10.1126/sciadv.aay8717
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发表时间：
2020-01-01
期刊：
影响因子：
13.6
通讯作者：
Mathias, S.
中科院分区：
文献类型：
--
作者：
Hofherr, M.;Haeuser, S.;Mathias, S.
利用光在物质的基本时间和长度尺度上操纵电子和自旋激发的愿景需要在实验和理论上采用新的方法来观察和理解这些激发。全光操纵的最终速度限制需要在激光激励脉冲的时间尺度上相干地操纵材料的电子或磁性子系统的控制方案。在我们的工作中，我们提供了在Fe和Ni合金的两个磁子系统之间发生这种直接、超快和共格自旋转移的实验证据。我们的实验结果得到了含时密度泛函理论模拟的充分支持，从而表明了在亚飞秒时间尺度上相干控制自旋动力学的可能性，即自旋磁学研究领域的诞生。
The vision of using light to manipulate electronic and spin excitations in materials on their fundamental time and length scales requires new approaches in experiment and theory to observe and understand these excitations. The ultimate speed limit for all-optical manipulation requires control schemes for which the electronic or magnetic subsystems of the materials are coherently manipulated on the time scale of the laser excitation pulse. In our work, we provide experimental evidence of such a direct, ultrafast, and coherent spin transfer between two magnetic subsystems of an alloy of Fe and Ni. Our experimental findings are fully supported by time-dependent density functional theory simulations and, hence, suggest the possibility of coherently controlling spin dynamics on subfemtosecond time scales, i.e., the birth of the research area of attomagnetism.