Soft X-ray Magnetorotation Spectroscopy

这项研究的目的是研制一种仪器。利用同步辐射（SR）多层偏振器进行（超）软x射线法拉第旋转测量，验证其在磁研究中的实用性，并将其扩展到使用实验室光源进行测量的能力。在第一年，我们设计并建造了法拉第旋转装置。偏光镜和分析仪采用Al/YB_6多层材料。磁场是用钐钴永磁体产生的。分析仪绕光轴旋转。整个装置安置在由涡轮分子泵抽真空的真空室中。第二年，我们首先在UVSOR分子科学研究所用SR做了法拉第旋转实验。采用透射式多层偏振器，提高了BL8B1处单色光的线偏振度。在50 ~ 70 eV范围内对Ni （M_<2,3>）、Co （M_<2,3>）和Co/Pt （Co - M_<2,3>, Pt - N_<6,7>）进行了测量。通过Kramers-Kronig分析，本实验得到的旋转角比总电子产率测量得到的MCD估计的旋转角大。因此，可以得出结论，法拉第旋转测量值受表面条件（如氧化）的影响比迄今为止进行的MCD测量值要小。其次，利用反射式多层偏振器对激光诱导等离子体的光进行线极化，并使用相同的磁体和分析仪，虽然结果有噪声，但得到了与SR一致的结果。这是首次在实验室中测量软x射线磁光效应。我们报告了Ni在12 Int上的结果。真空紫外线辐射物理学研讨会。我们将对其他尚未测量的磁性材料进行同样的测量。

The purpose of this research is to develop an apparatus. for the (ultra-) soft X-ray Faraday-rotation measurements utilizing multilayer polarizers using synchrotron radiation (SR), to verify its usefulness for the magnetic research and to extend its ability to the measurements using laboratory light source.In the first year, we designed and constructed the Faraday-rotation apparatus. A polarizer and a analyzer are Al/YB_6 multilayers. The magnetic field was generated by the use of Sm-Co permanent magnets. The analyzer was rotated around the optical axis. The whole apparatus was accommodated in a vacuum chamber evacuated by turbo-molecular pumps. In the second year, first we made the Faraday-rotation experiments using SR at UVSOR, Institute for Molecular Science. The degree of linear polarization of the monochromatized light at BL8B1 was made higher by the use of a transmission multilayer-polarizer. The measurements were carried out on Ni (M_<2,3> ), Co (M_<2,3> ) and Co/Pt (Co - M_<2,3>, Pt - N_<6,7>) in the 50 - 70 eV region. The rotation angles obtained by the present experiment were larger than the estimated ones from MCD obtained by total-electron-yield measurements, through Kramers-Kronig an alysis. Therefore, it is concluded that the Faraday-rotation measurements are less affected by the surface conditions such as oxidization, than the MCD measurements carried out so far. Secondly, we made the light from laser-induced plasma linearly polarized by the use of a reflection multilayer-polarizer, and used the same magnet and analyzer, and obtained consistent results with those obtained using SR though the results are noisy. This is the first measurement of the soft x-ray magnetooptical effects in laboratories. We reported the results on Ni at the 12th Int. Conf. on Vacuum Ultraviolet Radiation Physics. We will make the same measurements on the other magnetic materials not measured as yet.