Perspective: Ultrafast magnetism and THz spintronics
Perspective: Ultrafast magnetism and THz spintronics
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DOI：
10.1063/1.4958846
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发表时间：
2016-10-14
影响因子：
3.2
通讯作者：
Muenzenberg, Markus
中科院分区：
文献类型：
--
作者：
Walowski, Jakob;Muenzenberg, Markus
今年，激光脉冲飞秒退磁的发现已经 20 周年了。 Bigot 和同事的这项里程碑式的工作首次直接洞察了连接自旋和电子系统的微观相互作用的时间尺度。虽然过去过程的复杂性引发了该领域的激烈讨论，但现在很明显，这是一个由许多不同部分组成的难题。这一观点不是提供之前关于铁磁体超快过程的综述中提出的概述，而是表明，凭借我们目前的知识深度，开发出了第一个应用：太赫兹自旋电子学和全光学自旋操纵正变得越来越可行。这个视角的目的是指出我们可以在哪里将 20 年来收集的不同理解难题联系起来，以开发新颖的应用程序。基于大量实验中的许多观察。理论模型的差异源于铁磁性的定域和离域性质。在自旋电子器件和界面中，输运效应本质上是非局域的。我们回顾了多尺度建模的需求，以解决从皮米长度尺度和亚飞秒时间尺度上自旋系统的电子激励到自旋波生成，以及共同决定铁磁系统响应时间的超快相变建模的过程。今天，我们目前的理解产生了超快自旋物理在超快磁控制中的首次应用：太赫兹自旋电子器件。这使得超快自旋动力学领域成为目前许多研究人员开放的新兴课题。由 AIP 出版社出版。
This year the discovery of femtosecond demagnetization by laser pulses is 20 years old. For the first time, this milestone work by Bigot and coworkers gave insight directly into the time scales of microscopic interactions that connect the spin and electron system. While intense discussions in the field were fueled by the complexity of the processes in the past, it now became evident that it is a puzzle of many different parts. Rather than providing an overview that has been presented in previous reviews on ultrafast processes in ferromagnets, this perspective will show that with our current depth of knowledge the first applications are developed: THz spintronics and all-optical spin manipulation are becoming more and more feasible. The aim of this perspective is to point out where we can connect the different puzzle pieces of understanding gathered over 20 years to develop novel applications. Based on many observations in a large number of experiments. Differences in the theoretical models arise from the localized and delocalized nature of ferromagnetism. Transport effects are intrinsically non-local in spintronic devices and at interfaces. We review the need for multiscale modeling to address the processes starting from electronic excitation of the spin system on the picometer length scale and sub-femtosecond time scale, to spin wave generation, and towards the modeling of ultrafast phase transitions that altogether determine the response time of the ferromagnetic system. Today, our current understanding gives rise to the first usage of ultrafast spin physics for ultrafast magnetism control: THz spintronic devices. This makes the field of ultrafast spin-dynamics an emerging topic open for many researchers right now. Published by AIP Publishing.