论文标题
皮秒X射线磁性圆形二分色光谱在Fe L-Edges上具有激光驱动的等离子体源
Picosecond x-ray magnetic circular dichroism spectroscopy at the Fe L-edges with a laser-driven plasma source
论文作者
论文摘要
时间分辨的X射线磁循环二色性（XMCD）可以在多元素磁性材料中对复杂自旋和电荷动力学进行独特的光谱视图。到目前为止，其在软X射线范围内的应用仅限于同步量辐射源和自由电子激光器。通过将激光驱动的等离子体源与磁性薄膜偏振器相结合，我们在软X射线方向上产生圆极化的光子，从而在激光实验室的Fe L边缘实现了第一个XMCD光谱。我们的方法可以很容易地适应其他过渡金属L和稀土M吸收边缘，并且时间分辨率<10 ps，可以实现广泛的超快磁化研究。
Time-resolved x-ray magnetic circular dichroism (XMCD) enables a unique spectroscopic view on complex spin and charge dynamics in multi-elemental magnetic materials. So far, its application in the soft-x-ray range has been limited to synchrotron-radiation sources and free-electron lasers. By combining a laser-driven plasma source with a magnetic thin-film polarizer, we generate circularly polarized photons in the soft x-ray regime, enabling the first XMCD spectroscopy at the Fe L edges in a laser laboratory. Our approach can be readily adapted to other transition metal L and rare earth M absorption edges and with a temporal resolution of < 10 ps, a wide range of ultrafast magnetization studies can be realized.
