Distinguishing magnetic-moment and magnetic-ordering behavior in transition metal alloys

Abstract We report dichroism in angle-resolved X-ray photoemission with linearly polarized synchrotron radiation (MLDAD) of the 3p core levels of the ferromagnetic metals Fe, Ni, and their binary alloys. This technique is characterized by elemental specificity and surface sensitivity. A method has been introduced to accurately measure the magnetic dichroism asymmetry peak-to-peak amplitudes, A MLDAD , and the spectral width, W MLDAD . A MLDAD is a measure of the overall saturation magnetization, while W MLDAD reflects the magnitude of elemental magnetic moments. Deviations at the Invar composition Fe 65 Ni 35 are due to changes in magnetic order.