A versatile X-ray phase retarder for lock-in XMCD measurements.,Journal of Synchrotron Radiation

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A versatile X-ray phase retarder for lock-in XMCD measurements.
Journal of Synchrotron Radiation ( IF 2.4 ) Pub Date : 2020-08-06 , DOI: 10.1107/s1600577520009558
Eduardo H T Poldi ₁ , Carlos A Escanhoela ₁ , Jairo Fonseca ₁ , Marcos A S Eleotério ₁ , Ricardo D Dos Reis ₁ , Jonathan C Lang ₂ , Daniel Haskel ₂ , Narcizo M Souza-Neto ₁

Affiliation

X‐ray magnetic circular dichroism (XMCD) is a technique commonly used to probe magnetic properties of materials with element and orbital selectivity, which requires the use of circularly polarized (CP) X‐rays. It is possible to accomplish XMCD experiments with fixed CP and alternating the magnetic field orientation, but most reliable data are obtained when alternating the magnetization orientation and the polarization between right and left helicities. A versatile strategy has been developed to perform XMCD experiments using a hard X‐ray quarter‐wave plate, at both polychromatic dispersive and conventional monochromatic optics, in combination with synchronous data acquisition. The switching frequency waveform is fed into a lock‐in amplifier to detect and amplify the XMCD signal. The results on a reference sample demonstrate an improvement in data quality and acquisition time. The instrumentation successfully generated 98% of CP X‐rays switching the beam helicity at 13 Hz, with the possibility of faster helicity switching once it is installed at the new Brazilian fourth‐generation source, SIRIUS.

中文翻译：

多功能X射线相位延迟器，用于锁定XMCD测量。

X射线磁性圆二色性（XMCD）是一种通常用于探测具有元素和轨道选择性的材料的磁性的技术，该技术需要使用圆极化（CP）X射线。可以使用固定CP并交替改变磁场方向来完成XMCD实验，但是当交替改变磁化方向和左右旋度之间的极化时，可以获得最可靠的数据。已经开发了一种通用策略，可以使用硬X射线四分之一波片在多色色散和常规单色光学上结合同步数据采集来执行XMCD实验。开关频率波形被馈入锁定放大器，以检测和放大XMCD信号。参考样品的结果证明了数据质量和采集时间的改善。仪器成功产生98％的CP X射线，以13 Hz的频率切换光束螺旋度，一旦将其安装在巴西的第四代新光源SIRIUS上，就有可能更快地切换螺旋度。

更新日期：2020-08-06

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