Co50Pt50合金飞秒电荷和自旋动力学。

IF 2.3 2区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Structural Dynamics-Us Pub Date : 2025-04-25 eCollection Date: 2025-03-01 DOI:10.1063/4.0000297

Martin Pavelka, Simon Marotzke, Ru-Pan Wang, Mohamed F Elhanoty, Günter Brenner, Siarhei Dziarzhytski, Somnath Jana, W Dieter Engel, Clemens V Korff Schmising, Deeksha Gupta, Igor Vaskivskyi, Tim Amrhein, Nele Thielemann-Kühn, Martin Weinelt, Ronny Knut, Juliane Rönsch-Schulenberg, Evgeny Schneidmiller, Christian Schüßler-Langeheine, Martin Beye, Niko Pontius, Oscar Grånäs, Hermann A Dürr

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引用次数: 0

摘要

先进x射线源的使用在研究磁有序材料的动态过程中起着关键作用。x射线自由电子激光器的进展使人们能够分别通过瞬态x射线吸收光谱和x射线磁圆二色性直接和同时观察电子和自旋系统的飞秒演化。这样的实验使我们能够解决在光激发下自旋分裂价态的总体中所看到的响应。本文利用汉堡自由电子激光器FLASH上新型螺旋加力波动器产生的圆偏振超短软x射线脉冲，研究了激光激发CoPt合金在Co l3边缘吸收下的飞秒动力学。尽管采用了较弱的电子激发水平，但我们发现CoPt中Co 3d状态的消磁效果与之前CoPd的测量结果相当。这是由于3d和4d元素与3d和5d元素在相应合金和多层材料中的自旋轨道耦合明显不同。

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Femtosecond charge and spin dynamics in a Co₅₀Pt₅₀ alloy.

The use of advanced x-ray sources plays a key role in the study of dynamic processes in magnetically ordered materials. The progress in x-ray free-electron lasers enables the direct and simultaneous observation of the femtosecond evolution of electron and spin systems through transient x-ray absorption spectroscopy and x-ray magnetic circular dichroism, respectively. Such experiments allow us to resolve the response seen in the population of the spin-split valence states upon optical excitation. Here, we utilize circularly polarized ultrashort soft x-ray pulses from the new helical afterburner undulator at the free-electron laser FLASH in Hamburg to study the femtosecond dynamics of a laser-excited CoPt alloy at the Co L₃-edge absorption. Despite employing a weaker electronic excitation level, we find a comparable demagnetization for the Co 3d-states in CoPt compared to previous measurements on CoPd. This is attributed to the distinctly different spin-orbit coupling between 3d and 4d vs 3d and 5d elements in the corresponding alloys and multilayers.

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来源期刊

Structural Dynamics-Us CHEMISTRY, PHYSICALPHYSICS, ATOMIC, MOLECU-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

CiteScore

5.50

自引率

3.60%

发文量

审稿时长

16 weeks

期刊介绍： Structural Dynamics focuses on the recent developments in experimental and theoretical methods and techniques that allow a visualization of the electronic and geometric structural changes in real time of chemical, biological, and condensed-matter systems. The community of scientists and engineers working on structural dynamics in such diverse systems often use similar instrumentation and methods. The journal welcomes articles dealing with fundamental problems of electronic and structural dynamics that are tackled by new methods, such as: Time-resolved X-ray and electron diffraction and scattering, Coherent diffractive imaging, Time-resolved X-ray spectroscopies (absorption, emission, resonant inelastic scattering, etc.), Time-resolved electron energy loss spectroscopy (EELS) and electron microscopy, Time-resolved photoelectron spectroscopies (UPS, XPS, ARPES, etc.), Multidimensional spectroscopies in the infrared, the visible and the ultraviolet, Nonlinear spectroscopies in the VUV, the soft and the hard X-ray domains, Theory and computational methods and algorithms for the analysis and description of structuraldynamics and their associated experimental signals. These new methods are enabled by new instrumentation, such as: X-ray free electron lasers, which provide flux, coherence, and time resolution, New sources of ultrashort electron pulses, New sources of ultrashort vacuum ultraviolet (VUV) to hard X-ray pulses, such as high-harmonic generation (HHG) sources or plasma-based sources, New sources of ultrashort infrared and terahertz (THz) radiation, New detectors for X-rays and electrons, New sample handling and delivery schemes, New computational capabilities.