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arXiv 2202.13845cond-mat.mtrl-sciphysics.comp-phphysics.optics
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磁性多层膜系统超快X射线感生磁化动力学模型

Modeling of ultrafast X-ray induced magnetization dynamics in magnetic multilayer systems

K. J. Kapcia, V. Tkachenko, F. Capotondi, A. Lichtenstein, S. Molodtsov, L. Mueller, A. Philippi-Kobs, P. Piekarz, B. Ziaja

摘要:

在这项工作中,我们最近开发的模拟工具,使纳米级的描述电子过程中的X射线照射的铁磁材料的建模结果报告。利用这一工具,我们研究了Co/Pt多层膜系统在M边超快极紫外脉冲(光子能量$\sim$ 60 eV)辐照下的响应。它以前在费米自由电子激光设施,使用磁小角X射线散射技术进行了实验研究。我们的模拟表明,从钴的磁散射信号减少飞秒时间尺度上由于电子的激发,弛豫和运输过程中的钴和铂层,以下的趋势在实验数据中观察到的。电子过程的主导作用的X射线引起的退磁在制度下的结构损伤阈值的确认是一个步骤,定量控制和操纵的X射线引起的磁过程的飞秒时间尺度。

英文摘要:

In this work, we report on modelling results obtained with our recently developed simulation tool enabling nanoscopic description of electronic processes in X-ray irradiated ferromagnetic materials. With this tool, we have studied the response of Co/Pt multilayer system irradiated by an ultrafast extreme ultraviolet pulse at the M-edge of Co (photon energy $\sim$ 60 eV). It was previously investigated experimentally at the FERMI free-electron-laser facility, using the magnetic small-angle X-ray scattering technique. Our simulations show that the magnetic scattering signal from cobalt decreases on femtosecond timescales due to electronic excitation, relaxation and transport processes both in the cobalt and in the platinum layers, following the trend observed in the experimental data. The confirmation of the predominant role of electronic processes for X-ray induced demagnetization in the regime below the structural damage threshold is a step towards quantitative control and manipulation of X-ray induced magnetic processes on femtosecond timescales.

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