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.
The magnetic properties of Fe x Mn 1Ϫx /Ir(001) superlattices ͑SL's͒ have been studied using linearly polarized soft x-ray resonant magnetic reflectivity ͑XRMS͒ at the Fe L 2,3 absorption edges. Previous superconducting quantum interference device magnetometry measurements have shown that the SL's exhibit a ferromagnetic behavior for xϾ0.75 and a nonmagnetic or antiferromagnetic one for xϽ0.75. XRMS measurements were performed on two SL's with compositions on each side of xϭ0.75, as well as on a thin layer of Fe-rich alloy (xϭ0.9). The Fe magnetic moments in these alloys were determined by comparing experimental and calculated energy-dependent asymmetry ratios at different angles in the reflectivity curves. Fe atoms are found in a high-spin ferromagnetic state for xϭ0.9, while they are in a low-spin ferromagnetic state for xϭ0.7. Our results emphasize the role of the tetragonalization parameter c/a on the occurrence of the different magnetic states. Measurements, at the Mn L 2,3 edges in a bct Fe 0.9 Mn 0.1 ultrathin layer reveal a net magnetic moment per Mn atom of about 1.7 B coupled antiparallel to the Fe one. ͓S0163-1829͑99͒03933-8͔
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.