Magnetic Properties of Composition Modulated Amorphous Zr-Fe/Tb-Fe Multilayered Films Prepared by RF Sputtering Method

The changes in structure and saturation magnetization (4πM_s) due to composition modulation period (D), Curie temperature (T_c), perpendicular magnetic anisotropy (K_u), and polar Kerr rotation in composition modulated multilayered films with amorphous Zr-Fe films and amorphous Tb-Fe films superimposed were studied. It was found that as D₁, the composition modulation period calculated from the first X-ray diffraction peak, gets thinner, 4πM_s increases. This can be explained by the fact that magnetization of Fe within the Zr-Fe film is induced by the Tb-Fe film.