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Ultrafast demagnetization dominates fluence dependence of magnetic scattering at CoMedges
Physical Review Letters ( IF 8.6 ) Pub Date : 
Michael Schneider, Bastian Pfau, Christian M. Günther, Clemens von Korff Schmising, David Weder, Jan Geilhufe, Jonathan Perron, Flavio Capotondi, Emanuele Pedersoli, Michele Manfredda, Martin Hennecke, Boris Vodungbo, Jan Lüning, Stefan Eisebitt

We systematically study the fluence dependence of the resonant scattering cross-section from magnetic domains in Co/Pd-based multilayers. Samples are probed with single extreme ultraviolet (XUV) pulses of femtosecond duration tuned to the absorption resonances using the FERMI@Elettra free-electron laser (FEL). We report quantitative data over three orders of magnitude in fluence, covering with pulse lengths of and . A progressive quenching of the diffraction cross-section with fluence is observed. Compression of the same FEL pulse energy into a shorter pulse—implying increased XUV peak electric field—results in a reduced quenching of the resonant diffraction at the edge. We conclude that the quenching effect observed for resonant scattering involving the short-lived Co 3p core vacancies is noncoherent in nature, in contrast to previous reports investigating resonant scattering involving the longer-lived Co 2p states, where stimulated emission has been found to be important. A phenomenological model based on XUV-induced ultrafast demagnetization is able to reproduce our entire set of experimental data, and is found to be consistent with independent magneto-optical measurements of the demagnetization dynamics on the same samples.

中文翻译:

超快速退磁主导了CoMedges处磁散射的通量依赖性

我们系统地研究了基于Co / Pd多层膜中磁畴的共振散射截面的注量依赖性。使用FERMI @ Elettra自由电子激光(FEL)将飞秒持续时间的单个极紫外(XUV)脉冲调整到吸收共振,以探测样品。我们报告了通量的三个数量级以上的定量数据,覆盖了和的脉冲长度。观察到具有通量的衍射截面的逐渐淬灭。将相同的FEL脉冲能量压缩为更短的脉冲(这意味着XUV峰值电场增加)会减少边缘处的共振衍射的猝灭。我们得出的结论是,观察到的涉及短寿命Co 3p核空位的共振散射的猝灭效应在本质上是非相干的,与以前的报告相反,研究涉及寿命更长的Co 2p态的共振散射,其中发现受激发射很重要。基于XUV引起的超快退磁的现象学模型能够重现我们的整个实验数据集,并且被发现与相同样品上退磁动力学的独立磁光测量结果一致。
更新日期:2020-08-08
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