The indispensable role of the transversal spin fluctuations mechanism in laser-induced demagnetization of Co/Pt multilayers with nanoscale magnetic domains
The indispensable role of the transversal spin fluctuations mechanism in laser-induced demagnetization of Co/Pt multilayers with nanoscale magnetic domains
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横向自旋涨落机制在纳米级磁畴Co/Pt多层激光诱导退磁中不可或缺的作用
DOI：
10.1088/1361-6528/aabdc9
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发表时间：
2018-05
期刊：
影响因子：
3.5
通讯作者：
Cheng Zhao-Hua
中科院分区：
文献类型：
--
作者：
Zhang Wei;He Wei;Peng Li-Cong;Zhang Ying;Cai Jian-Wang;Zhang Xiang-Qun;Cheng Zhao-Hua
超短激光脉冲引起的磁畴切换已在纳米结构铁磁薄膜中得到证实。这开启了打破磁性开关和操纵速度终极物理极限的新时代的曙光，这与当前和未来的信息存储相关。然而，我们对具有纳米级域结构的磁性异质结构中光和自旋之间相互作用的理解仍然缺乏。在这里，进行了时间分辨磁光克尔效应实验和原子模拟，以研究具有纳米级磁畴的[Co/Pt]20多层中激光诱导超快退磁的主要机制。研究发现，超快退磁时间在各种磁配置下保持恒定，表明磁畴结构在激光诱导超快退磁中起着次要作用。此外，在实验和原子模拟中，我们发现超快退磁时间 τM 对激光注量的依赖性，这与磁域内自旋输运的观察相反。实验和原子模拟之间的显着一致性表明，自旋角动量的局部耗散是该系统中的主要退磁机制。更有趣的是，我们对原子自旋动力学模拟和纵向自旋翻转模型进行了比较，强调横向自旋波动机制是非均匀磁结构情况下超快退磁的原因。这是阐明非均匀磁结构超快退磁过程的微观机制的重大进展。
The switching of magnetic domains induced by an ultrashort laser pulse has been demonstrated in nanostructured ferromagnetic films. This leads to the dawn of a new era in breaking the ultimate physical limit for the speed of magnetic switching and manipulation, which is relevant to current and future information storage. However, our understanding of the interactions between light and spins in magnetic heterostructures with nanoscale domain structures is still lacking. Here, both time-resolved magneto-optical Kerr effect experiments and atomistic simulations are carried out to investigate the dominant mechanism of laser-induced ultrafast demagnetization in [Co/Pt]20 multilayers with nanoscale magnetic domains. It is found that the ultrafast demagnetization time remains constant with various magnetic configurations, indicating that the domain structures play a minor role in laser-induced ultrafast demagnetization. In addition, both in experiment and atomistic simulations, we find a dependence of ultrafast demagnetization time τM on the laser fluence, which is in contrast to the observations of spin transport within magnetic domains. The remarkable agreement between experiment and atomistic simulations indicates that the local dissipation of spin angular momentum is the dominant demagnetization mechanism in this system. More interestingly, we made a comparison between the atomistic spin dynamic simulation and the longitudinal spin flip model, highlighting that the transversal spin fluctuations mechanism is responsible for the ultrafast demagnetization in the case of inhomogeneous magnetic structures. This is a significant advance in clarifying the microscopic mechanism underlying the process of ultrafast demagnetization in inhomogeneous magnetic structures.
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影响因子：
16.6
作者：
Schellekens, A. J.;van den Brink, A.;Koopmans, B.
通讯作者：
Koopmans, B.
DOI：
10.1007/3-540-46097-7_8
发表时间：
2003
期刊：
--
影响因子：
--
作者：
B. Koopmans
通讯作者：
B. Koopmans
影响因子：
3.7
作者：
Moretti, Simone;Raposo, Victor;Lopez-Diaz, Luis
通讯作者：
Lopez-Diaz, Luis
影响因子：
3.7
作者：
Atxitia, U.;Chubykalo-Fesenko, O.;Muenzenberg, M.
通讯作者：
Muenzenberg, M.
具有增强垂直交换偏压的 [Co/Pt]/CoFe/IrMn 多层膜中的磁化反转不对称性
影响因子：
3.2
作者：
Wu, Qiong;He, Wei;Cheng, Zhao-Hua
通讯作者：
Cheng, Zhao-Hua