Directional spin dependent Compton profiles of ferromagnetic nickel metal have been measured with 55 keV circularly polarised synchrotron radiation and the results have been compared with an APW calculation of the electron momentum density. At low momenta where the negatively polarised 4s-p band reduces the spin dependent momentum density, the model predicts accurately the contribution to the (100) lineshape but significantly underestimates the (111) profile.
Directional magnetic Compton profiles in BCC iron have been measured with circularly polarised 60 keV synchrotron radiation. Further measurements on iron, which are of improved statistical quality, enable majority and minority directional difference profiles to be separated and a more specific test of band theory to be made. The results are generally in good agreement with APW calculations, except in low-momentum regions, where there are significant discrepancies.
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