熱分解法により作製されたBi, Ga(またはAl)置換ガーネット膜の磁気的，磁気光学的性質

抄録

Garnet films R_3-xBi_xFe_5-yM_yO₁₂(R=Y, Dy, Gd, M=Ga, Al, x=1.5, 1.0, y=0, 0.4, 0.8, 1.2) have been prepared on glass substrates by the pyrolisis method. When annealed above 640°C the films were polycrystalline with no crystal orientation and no impurity phase. They had smooth surface and optical uniformity except cracks, indicating that the pyrolisis method is useful1 for media formation. The magnetization and Faraday rotation of these films exhibited the behaviors expected for Ga or Al substitutions (y) because of the film composition precisely controlled through adjusting the solution composition. The magnetic easy axis in Bi, Ga (or Al) : YIG and Bi, Ga: GdIG films became normal to the film plane for y over 0.8 and just exceeding 0.1, respectively. On the other hand, that of Bi, Ga : DyIG film was normal to the film plane even for non-Ga substitution. This perpendicular magnetic anisotropy was explained in terms of induced stress. These indicate that Bi, Ga : DyIG film is promising material for magneto-optical recording.