A study of the electronic structure of Co-Pt alloys

We have studied the electronic structure of ion-beam-mixed and are-melted C o-Pt alloys by using X-ray photoelectron spectroscopy and X-ray absorption near-edge spectroscopy. The decrease of the white line area in the Pt L-3 a bsorption-edges was attributed to an increase in the number of d(5/2) elect rons at the Pt sites upon alloying with Co. The Co K near-edge region indic ated that the Co 4p charges transferred away from the Co sites. It was foun d that upon alloying there was an increase in the number of d(5/2) electron s at the Pt sites and a decrease in the number of p electrons at the Co sit es. The observed valence band changes were also explained in terms of charg e redistribution.