Bi-substituted DyIG thin films prepared by thermal decomposition method for magneto-optic recording medium.

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Abstract
Highly Bi substituted DyIG thin films on glass substrates having perpendicular anisotropy for magneto-optic recording have been prepared by a thermal decomposition method. Nitrate solutions were spin-coated on glass substrates and the films were annealed for crystallization ranging from 560 to 660 degree centigrade. The films were identified as single phase polycrystalline garnets from X-ray diffraction. By Dy substitution, uniaxial anisotropy energy (Ku) attained to 8 × 104 erg/cm3. Compositional dependence of saturation magnetostriction constant were measured using the cantilever method. It is clarified from a comparison of the measured and calculated values of anisotropies that the large Ku value of Dy substituted films is originated from the magnetostriction and internal stress. From static writing experiments, written bits about 1.5 μm in diameter were obtained. Faraday rotation coefficient is 3.7deg/μm at wavelength 633 nm when Bi content is 1.55 in a formula unit.