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Strong magnetic circular dichroism (MCD) in 4f photoemission from remanently magnetized films of Tb(0001) and TbFeₓ grown on W(110) is reported. Asymmetries of up to 62% have been observed for the 4f⁸{{{-}}}⁸S7/2 multiplet component, in agreement with a calculated 93% effect, taking into account the incomplete circular polarization of the photon beam and the experimental geometry. This is a very strong MCD effect and provides interesting perspectives for surface and thin-film magnetism, as well as a versatile sensor for circular polarization of soft x rays over a wide photon-energy range.
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Starke et al. (1994) studied this question.
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