Soft X-ray Magnetorotation Spectroscopy

本研究的目的是研制一种仪器。为了验证同步辐射多层偏振器用于(超)软X射线法拉第旋转测量的有效性，并将其扩展到利用实验室光源进行测量的能力。第一年，我们设计并建造了法拉第旋转装置。偏振器和分析器是Al/Yb_6多层膜。磁场是利用Sm-Co永磁体产生的。分析仪绕光轴旋转。整个装置被安置在一个由涡轮分子泵抽真空的真空室中。第二年，我们首先在UVSOR分子科学研究所使用SR进行了法拉第旋转实验。通过使用透射式多层偏振器，使BL8B1的单色化光线偏振度更高。测量是在50-70 eV范围内对Ni(M&lt；2，3&gt；)，Co(M&lt；2，3&gt；)和Co/Pt(Co-M&lt；2，3&gt；，Pt-N&lt；6，7&gt；)进行的。通过Kramers-Kronig分析，本实验得到的旋转角大于由总电子产额测量得到的MCD的估计旋转角。因此，法拉第旋转测量受表面条件(如氧化)的影响比迄今进行的MCD测量要小。其次，利用反射式多层膜偏振器对激光诱导等离子体产生的光进行了线偏振，并使用了相同的磁体和分析仪，得到了与随机共振结果一致的结果，虽然结果有噪声。这是首次在实验室中测量软X射线磁光效应。我们在第12届Int上报道了Ni的结果。电话会议论真空紫外线辐射物理学。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.