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Strong Non-Linear MCD-Effects Due to Partially Circular Polarized Light Sources

Published online by Cambridge University Press:  15 February 2011

Hartmut Höchst ,
Dai Zhao  and
David L. Huber
Hartmut Höchst
Affiliation:
Synchrotron Radiation Center, University of Wisconsin-Madison3731 Schneider Drive, Stoughton, WI53589–3097
Dai Zhao
Affiliation:
Synchrotron Radiation Center, University of Wisconsin-Madison3731 Schneider Drive, Stoughton, WI53589–3097
David L. Huber
Affiliation:
Synchrotron Radiation Center, University of Wisconsin-Madison3731 Schneider Drive, Stoughton, WI53589–3097
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Abstract

Most soft x-ray magnetic dichroism studies are carried out with light of mixed polarization. The effect of incomplete circular polarization is usually taken care off by linearly extrapolating the data to Pcirc=l. Using a classical model which includes the polarization factor we show that the MCD-effect, which is the normalized quantity 2(I+-I-)/(I++I-), is highly non-linear with regard to cire. With a specially designed quadruple reflection phase shifter we measured the MCD effect with Pcire<l as well as with Pcirc∼1. MCD spectra of Fe around the M2,3 transition verify our model calculations of the polarization dependence. The data indicate that the observed non-linear response of the MCD-effect to Pcirc can generally introduce large errors in the quantitative analysis of MCD data where spin <Sz> and orbital <LZ> moments are extracted by means of sum rules.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 475: Symposium M – Magnetic Ultrathin Films, Multilayers, and Surfaces – 1997 , 1997 , 315
Copyright
Copyright © Materials Research Society 1997

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References

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