Abstract
Magneto-optical recording materials with high remanent Kerr rotation at short wavelengths were successfully obtained in a trilayer form. A NdFeCo amorphous film with in-plane magnetization, but with a large saturation Kerr rotation angle at short wavelengths, was sandwiched between TbFeCo amorphous films with strong perpendicular anisotropy and high coercivity. The trilayer film, Tb20Fe74Co6 (10 nm)/Nd16Fe57Co27 (7.5 nm)/Tb20Fe74Co6 (100 nm), shows a remanent Kerr rotation angle θKr = 0.32° at a wavelength of 400 nm, coercivity Hc = 2.4kOe, and a good square loop (θKr/θKs ∼ 1).
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