Spin-dependent momentum distribution in iron studied with circularly polarized synchrotron radiation

The spin-dependent Compton profile of ferromagnetic iron has been measured with circularly polarized synchrotron radiation extracted at 46 and 62 keV from the Daresbury storage ring by viewing radiation from the 5-T magnet at 0.24 mrad above and below the electron orbital plane. For the first time (to our knowledge) in a photon scattering experiment the line shape is well established. The negative magnetization resulting from $s-p$ polarization is evident here as a 25% dip around zero momentum, which is greater than that predicted by an augmented-plane-wave calculation of this effect.