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Effect of 3rd Elements on Magnetic and Magneto-Optical Properties in Amorphous R-T Film

Introduction Amorphous R-T film is now being studied everywhere for use as a magneto-optical memory medium. However, one problem often cited is its small magneto-optic effect. Research into this matter is being conducted in many places. We tried adding Sn, Sb, Pt, Au, Pd, Ag, Cu, Mg, Nb, Si as a third element to amorphous GdTbCoFe film and TbCo film. We then studied the changes in the polar Kerr rotation angle (OK) and the perpendicular magnetic anisotropy constant (Ku).