Abstract
Magneto-optical properties of Fe-F, Co-F and Ni-F films have been investigated. The films were produced by rf-sputtering using compressed powder targets of FeF3, CoF3 and NiF2. The structure of films was confirmed to be amorphous, containing a small amount of crystalline fluoride. Some of the films showed perpendicular magnetic anisotropy, high coercivity (600∼2000 Oe), fairly high remanence ratio (∼0.7), and saturation magnetization of 5∼50 emu/g. The films also exhibited Faraday rotation coefficient of ∼104 deg/cm in low wavelength range and depended smoothly on wavelength for 500∼2000 nm. Optical absorption coefficient was also at the level of∼104 cm-1 for 400∼1500 nm. Both Kerr rotation angle and reflection spectrum varied depending on wavelength in the transparent films. The electronic structure of films was measured by soft X-ray spectroscopy and thought to be in an interme-diate state between metallic and compound states.
