用时间分辨螺旋磁二色性探测磁涡旋动力学

IF 9 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Mauro Fanciulli, Matteo Pancaldi, Anda-Elena Stanciu, Matthieu Guer, Emanuele Pedersoli, Dario De Angelis, Primož Rebernik Ribič, David Bresteau, Martin Luttmann, Pietro Carrara, Arun Ravindran, Benedikt Rösner, Christian David, Carlo Spezzani, Michele Manfredda, Ricardo Sousa, Laurent Vila, Ioan Lucian Prejbeanu, Liliana D. Buda-Prejbeanu, Bernard Dieny, Giovanni De Ninno, Flavio Capotondi, Thierry Ruchon, Maurizio Sacchi
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引用次数: 0

摘要

在不施加外场的情况下,激光激发磁化动力学是一个非常有趣的话题,因为它具有潜在的应用(例如,磁存储器,振荡器和太赫兹发射器)。我们探索了利用超短红外激光脉冲触发磁涡流的瞬态变化,通过共振极紫外散射的时间分辨磁螺旋二色性(MHD)探测诱导动力学。MHD描述了磁性样品在光轨道角动量或磁化的符号反转时的光学响应,并被证明对样品的自旋织构很敏感。在这里,我们表明,除了众所周知的超快退磁和再磁化激光诱导过程外,对MHD信号的分析,在微磁模拟的支持下,为自旋织构的重要瞬态重组提供了直接证据。特别是,我们发现足够强度的超快激光脉冲可以诱导表面瞬态磁织构,其中涡旋卷曲方向相对于体相反。这一结果为在不施加外场的情况下用光学方法制备磁膜中的亚稳态复杂自旋态提供了新的见解,这对于数据存储和操作的新应用具有重要意义。2025年由美国物理学会出版
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Magnetic Vortex Dynamics Probed by Time-Resolved Magnetic Helicoidal Dichroism
The laser excitation of magnetization dynamics without applying external fields is a topic of high interest for its potential applications (e.g., magnetic memories, oscillators, and THz emitters). We explore the use of an ultrashort infrared laser pulse for triggering transient changes in a magnetic vortex, probing the induced dynamics by time-resolved magnetic helicoidal dichroism (MHD) in resonant extreme ultraviolet scattering. MHD describes the optical response of a magnetic sample upon sign reversal of either the light orbital angular momentum or the magnetization and was demonstrated to be sensitive to the sample spin texture. Here, we show that, in addition to the well-known ultrafast demagnetization and remagnetization laser-induced processes, the analysis of the MHD signal, supported by micromagnetic simulations, provides direct evidence of important transient reorganizations of the spin texture. In particular, we find that an ultrafast laser pulse of sufficient intensity can induce a surface transient magnetic texture where the vortex curling direction is reversed with respect to the bulk. This result provides insight into the preparation of metastable complex spin states in magnetic films by optical methods without applying an external field, which is of relevance for novel applications in data storage and manipulation. Published by the American Physical Society 2025
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来源期刊
Physical review letters
Physical review letters 物理-物理:综合
CiteScore
16.50
自引率
7.00%
发文量
2673
审稿时长
2.2 months
期刊介绍: Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks
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