用飞秒极紫外脉冲对 DyCo5 薄膜进行瞬态光栅光谱分析

Victor Ukleev, Ludmila Leroy, Riccardo Mincigrucci, Dario Deangelis, Danny Fainozzi, Nupur Ninad Khatu, Ettore Paltanin, Laura Foglia, Filippo Bencivenga, Chen Luo, Florian Ruske, Florin Radu, Cristian Svetina, Urs Staub
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引用次数: 0

摘要

室温铁磁性 DyCo5 合金中的飞秒极紫外(EUV)瞬态光栅(TGs)激发了表面声波(SAWs)。瞬态光栅是通过自由电子激光器发出的一对波长为20.8 nm、与钴M边相匹配的极紫外光脉冲产生的,从而产生了波长为Λ = 44 nm的声表面波。利用反射几何中的泵浦-探针瞬态光栅方案,可以在薄膜中 -10 至 100 ps 的时间范围内跟踪激发的声表面波。利用超快超紫外脉冲相干产生 TG,可以激发任何材料中的声表面波,并研究它们与自旋波和轨道动力学等其他动力学的耦合。与此相反,我们在探测电子和磁信号时遇到了挑战,这可能是由于较大的声表面波信号占主导地位,而来自底层的反射信号较弱。后一个挑战的潜在解决方案是采用软 X 射线探针,尽管会带来与所需掠入射几何形状相关的额外复杂性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Transient grating spectroscopy on a DyCo5 thin film with femtosecond extreme ultraviolet pulses
Surface acoustic waves (SAWs) are excited by femtosecond extreme ultraviolet (EUV) transient gratings (TGs) in a room-temperature ferrimagnetic DyCo5 alloy. TGs are generated by crossing a pair of EUV pulses from a free electron laser with the wavelength of 20.8 nm matching the Co M-edge, resulting in a SAW wavelength of Λ = 44 nm. Using the pump-probe transient grating scheme in reflection geometry, the excited SAWs could be followed in the time range of −10 to 100 ps in the thin film. Coherent generation of TGs by ultrafast EUV pulses allows to excite SAW in any material and to investigate their couplings to other dynamics, such as spin waves and orbital dynamics. In contrast, we encountered challenges in detecting electronic and magnetic signals, potentially due to the dominance of the larger SAW signal and the weakened reflection signal from underlying layers. A potential solution for the latter challenge involves employing soft x-ray probes, albeit introducing additional complexities associated with the required grazing incidence geometry.
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