注意：基于铁磁薄膜的软X射线透射偏振器。

Note: Soft X-ray transmission polarizer based on ferromagnetic thin films.

作者信息

Müller L, Hartmann G, Schleitzer S, Berntsen M H, Walther M, Rysov R, Roseker W, Scholz F, Seltmann J, Glaser L, Viefhaus J, Mertens K, Bagschik K, Frömter R, De Fanis A, Shevchuk I, Medjanik K, Öhrwall G, Oepen H P, Martins M, Meyer M, Grübel G

机构信息

Deutsches Elektronen-Synchrotron DESY, FS-CXS, 22607 Hamburg, Germany.

Deutsches Elektronen-Synchrotron DESY, FS-PE, 22607 Hamburg, Germany.

出版信息

Rev Sci Instrum. 2018 Mar;89(3):036103. doi: 10.1063/1.5018396.

DOI:10.1063/1.5018396

PMID:29604789

Abstract

A transmission polarizer for producing elliptically polarized soft X-ray radiation from linearly polarized light is presented. The setup is intended for use at synchrotron and free-electron laser beamlines that do not directly offer circularly polarized light for, e.g., X-ray magnetic circular dichroism (XMCD) measurements or holographic imaging. Here, we investigate the degree of ellipticity upon transmission of linearly polarized radiation through a cobalt thin film. The experiment was performed at a photon energy resonant to the Co L-edge, i.e., 778 eV, and the polarization of the transmitted radiation was determined using a polarization analyzer that measures the directional dependence of photo electrons emitted from a gas target. Elliptically polarized radiation can be created at any absorption edge showing the XMCD effect by using the respective magnetic element.

摘要

介绍了一种用于从线偏振光产生椭圆偏振软X射线辐射的透射偏振器。该装置旨在用于同步加速器和自由电子激光光束线，这些光束线不能直接提供圆偏振光用于例如X射线磁圆二色性（XMCD）测量或全息成像。在此，我们研究了线偏振辐射透过钴薄膜时的椭圆率。实验在与Co L边共振的光子能量下进行，即778 eV，并且使用偏振分析仪确定透射辐射的偏振，该偏振分析仪测量从气体靶发射的光电子的方向依赖性。通过使用相应的磁性元件，可以在任何显示XMCD效应的吸收边缘产生椭圆偏振辐射。