Capturing ultrafast magnetic dynamics by time-resolved soft x-ray magnetic circular dichroism
Capturing ultrafast magnetic dynamics by time-resolved soft x-ray magnetic circular dichroism
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DOI：
10.1063/1.4981769
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发表时间：
2017-01
影响因子：
4
通讯作者：
K. Takubo;Kohei Yamamoto;Y. Hirata;Y. Yokoyama;Y. Kubota;Shingo Yamamoto;Susumu Yamamoto;I. Matsuda;Shik Shin;T. Seki;K. Takanashi;H. Wadati
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文献类型：
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作者：
K. Takubo;Kohei Yamamoto;Y. Hirata;Y. Yokoyama;Y. Kubota;Shingo Yamamoto;Susumu Yamamoto;I. Matsuda;Shik Shin;T. Seki;K. Takanashi;H. Wadati
本文介绍了在SPring-8中BL 07 LSU光束线上进行的时间分辨X射线磁圆二色性（Tr-XMCD）和共振X射线散射实验，时间分辨小于50 ps。一个微通道板被用于Tr-XMCD测量在近垂直入射的部分电子和总荧光产额（PEY和TFY）模式在L2，3吸收边的3d过渡金属在软X射线区域。在FePt薄膜磁性材料的动力学上观察到50 ps以内的超快光致退磁，具有明显的光子密度阈值。与TFY模式相比，PEY模式下的光谱在L2，3边缘处的畸变较小，并且具有将求和规则分析应用于泵浦探测实验中的XMCD光谱的潜力。
Experiments of time-resolved x-ray magnetic circular dichroism (Tr-XMCD) and resonant x-ray scattering at a beamline BL07LSU in SPring-8 with a time-resolution of under 50 ps are presented. A micro-channel plate is utilized for the Tr-XMCD measurements at nearly normal incidence in both the partial electron and total fluorescence yield (PEY and TFY) modes at the L2,3 absorption edges of the 3d transition-metals in the soft x-ray region. The ultrafast photo-induced demagnetization within 50 ps is observed on the dynamics of a magnetic material of FePt thin films, having a distinct threshold of the photon density. The spectrum in the PEY mode is less-distorted at both the L2,3 edges compared with that in the TFY mode and has the potential to apply the sum rule analysis for XMCD spectra in pump-probed experiments.