Abstract
Nanocomposite CoPt:C films were fabricated by sputtering Co, Pt and C onto water-cooled Si(100) substrates with subsequent annealing. The microstructure and the magnetic properties of these CoPt:C films were investigated as a function of Pt concentration. It was found that the orientations of CoPt grains and the magnetic properties are related strongly to the Pt content. Perpendicular anisotropy was observed in the films with high Pt content. By changing Pt concentrations, films with adjustable coercivity, a grain size less than 10 nm and strong perpendicular magnetic anisotropy were obtained. The crystal lattice structure and the intergranular interactions were proposed to be key factors in the magnetic properties of the CoPt:C films. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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