Abstract
Co75Pt25 films deposited onto Al2O3(0001), Al2O3(11-20) and, MgO(111) substrates at substrate deposition temperatures from 230 to 450°C exhibit a large perpendicular magnetic anisotropy ( > 1.0 × 107 erg/cm3 at room temperature). X-ray diffraction analyses reveal the presence of the hcp CO3Pt ordered state in these films. A close correlation between the ordered state and the large perpendicular anisotropy is found for films deposited at 380°C and above. Magneto-optical spectra show a characteristic peak for the film with ordered structure in a photon energy range from 2 to 4 eV in both of Kerr rotation and ellipticity. Magneto-optical properties of Co-Pt alloys above 5 eV are studied for the first time, where high positive Kerr rotation is observed.
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