Ultrafast optical manipulation of magnetic order
Ultrafast optical manipulation of magnetic order
复制标题
DOI：
10.1103/revmodphys.82.2731
复制
发表时间：
2010-09-22
影响因子：
44.1
通讯作者：
Rasing, Theo
中科院分区：
文献类型：
--
作者：
Kirilyuk, Andrei;Kimel, Alexey V.;Rasing, Theo
亚皮秒激光脉冲与磁有序材料的相互作用已发展成为现代磁性学中一个令人着迷的研究课题。从十多年前亚皮秒退磁的发现到最近通过单个 40 fs 激光脉冲演示磁化反转，超短激光脉冲操纵磁序已成为一个具有根本挑战性的课题，对未来的自旋电子学、数据存储和操纵以及量子计算具有潜在的巨大影响。了解潜在的机制意味着了解光子与电荷、自旋和晶格的相互作用，以及它们之间的角动量转移。本文将系统回顾激光磁序调控领域的进展。从历史介绍开始，讨论光与磁有序物质的相互作用。通过研究金属、半导体和电介质，可以部分分离（几乎）自由电子、电荷重新分布以及自旋轨道和自旋晶格相互作用的作用，并且可以区分由加热引起的效应与非加热效应。我们将证明，涉及光子实际吸收的过程和不涉及光子实际吸收的过程之间存在根本区别。事实证明，对于后者，光的偏振在飞秒时间尺度的磁矩操纵中起着至关重要的作用。因此，圆偏振脉冲和线偏振脉冲分别被证明充当源自非吸收性逆法拉第效应和逆科顿-穆顿效应的强瞬态磁场脉冲。对飞秒时间尺度上的磁光效应的理解的最新进展以及所提到的逆光磁效应为磁序或飞磁的超快光学操纵领域带来了光明的未来。
The interaction of subpicosecond laser pulses with magnetically ordered materials has developed into a fascinating research topic in modern magnetism. From the discovery of subpicosecond demagnetization over a decade ago to the recent demonstration of magnetization reversal by a single 40 fs laser pulse, the manipulation of magnetic order by ultrashort laser pulses has become a fundamentally challenging topic with a potentially high impact for future spintronics, data storage and manipulation, and quantum computation. Understanding the underlying mechanisms implies understanding the interaction of photons with charges, spins, and lattice, and the angular momentum transfer between them. This paper will review the progress in this field of laser manipulation of magnetic order in a systematic way. Starting with a historical introduction, the interaction of light with magnetically ordered matter is discussed. By investigating metals, semiconductors, and dielectrics, the roles of (nearly) free electrons, charge redistributions, and spin-orbit and spin-lattice interactions can partly be separated, and effects due to heating can be distinguished from those that are not. It will be shown that there is a fundamental distinction between processes that involve the actual absorption of photons and those that do not. It turns out that for the latter, the polarization of light plays an essential role in the manipulation of the magnetic moments at the femtosecond time scale. Thus, circularly and linearly polarized pulses are shown to act as strong transient magnetic field pulses originating from the nonabsorptive inverse Faraday and inverse Cotton-Mouton effects, respectively. The recent progress in the understanding of magneto-optical effects on the femtosecond time scale together with the mentioned inverse, optomagnetic effects promises a bright future for this field of ultrafast optical manipulation of magnetic order or femtomagnetism.