Amorphous light rare earth-alloy of transition metal and semimetal, a magneto-optical recording film formed therefrom, and a magneto-optical disk employing this recording film

摘要

In the present invention, an amorphous light rare earth-transition metal and a semi-metal alloy having perpendicular magnetic anisotropy without decreasing the magnetic moment of a light rare earth metal in a short wavelength region, a short wavelength recording film made of this alloy, A magneto-optical disk is disclosed. According to the magneto-optical recording film of the present invention, by adding a semimetal to the amorphous light rare earth-transition metal, pd electron orbital coupling is induced between the transition metal and the semimetal in the light rare earth metal-transition metal-semimetal amorphous alloy The antiferromagnetic energy of the amorphous alloy of the present invention can be reduced with the decrease of the magnetic moment of the transition metal without affecting the magnetic moment of the light rare earth metal. Therefore, the magneto-optical disk of the present invention can attain perpendicular magnetic anisotropy in a short wavelength region, can maintain a large curved rotation angle, and is very effective as a magneto-optical recording medium having excellent magneto-optical characteristics.