Abstract
The magnetic properties of CoPt with different percentages of oxygen in the TiOx capping layer were investigated through annealing processes. Results have shown that after annealing, the structural phase transformation from fcc to fct CoPt occurred and was confirmed by the enhanced coercivities. In addition, the isolated CoPt grains separated by grain boundary TiOx in the annealed CoPt/TiOx (30% O2/Ar) thin films exhibited the largest coercivity. The excess amount of oxygen in the TiOx layer may react with Co and Pt to form oxides (as characterized by XPS) and result in the drop of coercivity. Thus the growth of the fct CoPt phase can be enhanced by optimizing the oxygen ratio during fabrication of the TiOx layer and post annealing, which may find useful applications for future CoPt-based magnetic recording.
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