Magnetic Compton Scattering and Measurements of Momentum Distribution of Magnetic Electrons

Abstract

Recent progress in the field of magnetic Compton scattering is reviewed and new momentum-space information about electronic states in magnetic materials is emphasized. Theoretical derivation of the magnetic Compton scattering cross section is made within the framework of the nonrelativistic Hamiltonian of electrons in the electromagnetic field. Discussion on the orbital-spin contribution to the magnetic Compton scattering is also included as a Compton limit. The feasibility of the magnetic Compton scattering experiment using circularly polarized hard synchrotron radiation is demonstrated by many recent experimental results.

Perpendicular magnetic anisotropy in Co/Pt multilayers studied from a view point of anisotropy of magnetic Compton profiles

“…It is well known that MCP measurement observes only the spin contribution and the anisotropy of the MCP gives the anisotropy of spin projected momentum density. [12][13][14][15] Recently we have made the observation of anisotropy in magnetic Compton profiles of Co/Pd multilayers, 16,17 and succeeded to decompose symmetry of the Co 3d electron into the each magnetic quantum number, ͉m͉ = 0, 1, and 2. Then it has been found that both the ͉m͉ = 1 and 2 states of Co 3d electron contribute to the PMA.…”

“…[12][13][14] If we can understand the system as compose of independent particles described by single wave function, i ͑r͒ ͑ = majority spin or minority spin͒, within the limit of the impulse approximation, we can write for the momentum density by summing over all occupied single electron states of the system; 12…”

High-Energy Inelastic-Scattering Beamline for Electron Momentum Density Study

“…In x3, recent progress in highresolution Compton scattering spectroscopy is presented in order to demonstrate its potential. Recent magnetic Compton scattering experiments are not presented in this paper; instead the reader is referred to Sakai (1996) for details of recent magnetic Compton scattering experiments using a multi-element solid-state detector.…”

“…However, these photon sources are not optimal for high-resolution and magnetic Compton scattering experiments. Recent advents of highintensity, high-energy and well polarized synchrotron radiation sources offer new opportunities for developing Compton scattering as a tool for investigating Fermiologyrelated issues, electron±electron correlation effects and ferromagnetism in a wide class of materials Sakurai et al, 1992;Sakai, 1996).…”

“…Concerning magnetic Compton spectroscopy, experiments using a pure-Ge solidstate detector (SSD) were extensively performed for 3d and 4f metals and alloys using circularly polarized 45± 60 keV X-rays from an elliptic multipole wiggler (Sakai, 1996). In the case of 4f elements, however, the counting rates were dominated by¯uorescent X-rays.…”