A new soft X-ray magnetic circular dichroism facility at the BSRF beamline 4B7B  

作　　者：郭志英 洪才浩 邢海英 唐坤 郑雷 徐伟 陈栋梁 崔明启 赵屹东 

机构地区：[1]Institute of High Energy Physics, Chinese Academy of Sciences [2]School of Electronics and Information Engineering, Tianjin Polytechnic University

出　　处：《Chinese Physics C》2015年第4期100-104,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(61204008)

摘　　要：X-ray magnetic circular dichroism （XMCD） has become an important and powerful tool because it allows the study of material properties in combination with elemental specificity, chemical state specificity, and magnetic specificity. A new soft X-ray magnetic circular dichroism apparatus has been developed at the Beijing Synchrotron Radiation Facility （BSRF）. The apparatus combines three experimental conditions： an ultra-high-vacuum environ- ment, moderate magnetic fields and in-situ sample preparation to measure the absorption signal. We designed a C-type dipole electromagnet that provides magnetic fields up to 0.5 T in parallel （or anti-parallel） direction rela- tive to the incoming X-ray beam. The performances of the electromagnet are measured and the results show good agreement with the simulation ones. Following film grown in situ by evaporation methods, XMCD measurements are performed. Combined polarization corrections, the magnetic moments of the Fe and Co films determined by sum rules are consistent with other theoretical predictions and experimental measurements.X-ray magnetic circular dichroism （XMCD） has become an important and powerful tool because it allows the study of material properties in combination with elemental specificity, chemical state specificity, and magnetic specificity. A new soft X-ray magnetic circular dichroism apparatus has been developed at the Beijing Synchrotron Radiation Facility （BSRF）. The apparatus combines three experimental conditions： an ultra-high-vacuum environ- ment, moderate magnetic fields and in-situ sample preparation to measure the absorption signal. We designed a C-type dipole electromagnet that provides magnetic fields up to 0.5 T in parallel （or anti-parallel） direction rela- tive to the incoming X-ray beam. The performances of the electromagnet are measured and the results show good agreement with the simulation ones. Following film grown in situ by evaporation methods, XMCD measurements are performed. Combined polarization corrections, the magnetic moments of the Fe and Co films determined by sum rules are consistent with other theoretical predictions and experimental measurements.

关 键 词：X-ray magnetic circular dichroism （XMCD） sum rule synchrotron radiation （SR） ELECTROMAGNET POLARIZATION 

分 类 号：O434.1[机械工程—光学工程]