Open AccessX‐ray magnetic circular dichroism with tunable polarization helicity
Author(s) -
Varga L.,
Giles C.,
Zheng Y. L.,
Pizzini S.,
De Bergevin F.,
Fontaine A.,
Malgrange C.
Publication year - 1999
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049599011267
Subject(s) - helicity , magnetic circular dichroism , polarization (electrochemistry) , optics , circular polarization , magnetic field , physics , x ray magnetic circular dichroism , diffraction , spectral line , materials science , nuclear magnetic resonance , chemistry , quantum mechanics , microstrip , particle physics , astronomy
X‐ray magnetic circular dichroism spectra have previously been obtained by switching the polarization helicity with a diamond quarter‐wave plate (QWP) and keeping the applied magnetic field on the sample as an independent variable [Giles, Malgrange, Goulon, de Bergevin, Vettier, Fontaine, Dartyge & Pizzini (1994). Nucl. Instrum. Methods , A 349 , 622–625]. These results were obtained by subtracting an undesirable non‐magnetic residual spectrum. Experiments reported here show that this residual spectrum mainly originates from a slight lateral displacement of the forward‐diffracted beam in the QWP. A quantitative analysis of the phenomenon is in good agreement with predictions from X‐ray dynamical theory.