Tolentino Hélio C N, Cezar Júlio C, Souza-Neto Narcizo M, Ramos Aline Y
Laboratório Nacional de Luz Síncrotron, CP 6192, 13084-971, Campinas, SP, Brazil.
J Synchrotron Radiat. 2005 Mar;12(Pt 2):168-76. doi: 10.1107/S0909049504032753. Epub 2005 Feb 22.
The remarkable polarization properties of synchrotron light have lead to the advent of modern synchrotron-related spectroscopic studies with angular and/or magnetic selectivity. Here an overview is given of the prominent aspects of the polarization of the light delivered by a bending magnet, and some dichroic properties in X-ray absorption spectroscopy (XAS). Two studies developed at the Brazilian Synchrotron Light Laboratory are then reported, exemplifying the profit gained using linear and circular polarization of X-rays for the study of magnetic thin films and multilayers. Angle-resolved XAS was used in strained manganite thin films to certify a model of local distortion limited within the MnO6 polyhedron. A pioneering experience of X-ray magnetic scattering at grazing incidence associated with dispersive XAS in a Co/Gd multilayer draws new perspectives for magnetic studies in thin films and multilayers under atmospheric conditions in the hard X-ray range.
同步辐射光显著的偏振特性催生了具有角度和/或磁选择性的现代同步辐射相关光谱研究。本文概述了弯曲磁铁所发出光的偏振的突出方面，以及X射线吸收光谱（XAS）中的一些二向色性特性。接着报告了巴西同步辐射光实验室开展的两项研究，例证了利用X射线的线偏振和圆偏振来研究磁性薄膜和多层膜所获得的成效。在应变锰氧化物薄膜中使用角度分辨XAS来验证MnO6多面体内局部畸变受限的模型。在Co/Gd多层膜中，掠入射X射线磁散射与色散XAS相关的开创性实验为硬X射线范围内大气条件下薄膜和多层膜的磁性研究开辟了新的视角。
