All-optical control of spin in a 2D van der Waals magnet.
All-optical control of spin in a 2D van der Waals magnet.
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DOI：
10.1038/s41467-022-33343-4
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发表时间：
2022-10-10
影响因子：
16.6
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中科院分区：
文献类型：
--
作者：
二维 (2D) 范德华磁体为通过应变、电压和光伏效应等机制在纳米尺度上控制磁性提供了新的机会。超快激光脉冲有望成为操纵电子自旋的最快、最节能的方法，并可用于信息存储。然而，人们对激光脉冲如何影响二维磁体的自旋知之甚少。在这里，我们展示了最近发现的二维范德华铁磁体 CrI3 中激光诱导磁畴的形成和全光切换。虽然裸露 CrI3 层的磁性可以通过热退磁过程用单个激光脉冲进行控制，但在将超薄 CrI3 与单层 WSe2 结合在一起的纳米结构中实现了全光开关。面外磁化强度通过圆偏振或线偏振的多个飞秒脉冲进行切换，而单个脉冲会导致可重复性较差和部分切换。我们的结果表明，WSe2 和 CrI3 之间的自旋相关界面电荷转移是切换的基础机制，为未来光磁记录和设备技术的 2D 范德华磁体的超快光学控制铺平了道路。利用光驱动材料磁化具有巨大的技术潜力，并且可以深入了解磁系统的快速动力学。在这里，作者将 CrI3（一种范德华磁体）与 WSe2 结合起来，并演示了所得异质结构的所有光学开关。
Two-dimensional (2D) van der Waals magnets provide new opportunities for control of magnetism at the nanometre scale via mechanisms such as strain, voltage and the photovoltaic effect. Ultrafast laser pulses promise the fastest and most energy efficient means of manipulating electron spin and can be utilized for information storage. However, little is known about how laser pulses influence the spins in 2D magnets. Here we demonstrate laser-induced magnetic domain formation and all-optical switching in the recently discovered 2D van der Waals ferromagnet CrI3. While the magnetism of bare CrI3 layers can be manipulated with single laser pulses through thermal demagnetization processes, all-optical switching is achieved in nanostructures that combine ultrathin CrI3 with a monolayer of WSe2. The out-of-plane magnetization is switched with multiple femtosecond pulses of either circular or linear polarization, while single pulses result in less reproducible and partial switching. Our results imply that spin-dependent interfacial charge transfer between the WSe2 and CrI3 is the underpinning mechanism for the switching, paving the way towards ultrafast optical control of 2D van der Waals magnets for future photomagnetic recording and device technology. The use of light in driving the magnetization of materials has great technological potential, as well as allowing for insights into the fast dynamics of magnetic systems. Here, the authors combine CrI3, a van der Waals magnet, with WSe2, and demonstrate all optical switching of the resulting heterostructure.
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