位于BSRF光束线4 B 7 B的新型软X射线磁性圆二色性设施
A new soft X-ray magnetic circular dichroism facility at the BSRF beamline 4B7B
摘要：
X射线磁性圆二色性（XMCD）已成为一种重要而强大的工具，因为它允许结合元素特异性、化学状态特异性和磁性特异性来研究材料性质。在北京同步辐射装置（BSRF）上研制了一台新的软X射线磁性圆二色性装置。该装置结合了超高真空环境、中等磁场和原位样品制备三种实验条件来测量吸收信号。我们设计了一个C型偶极电磁铁，它可以提供相对于入射X射线束平行（或反平行）方向高达0.5T的磁场。对电磁铁的性能进行了测试，测试结果与仿真结果吻合较好。在通过蒸发方法原位生长膜之后，进行XMCD测量。结合极化修正，由求和规则确定的Fe和Co薄膜的磁矩与其他理论预测和实验测量结果一致。
英文摘要：
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: ultra-high-vacuum environment, 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 0.5T in parallel (or anti-parallel) direction relative 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.
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