Abstract
For reducing the critical diameter of the written domain in magnetic garnet films for magneto-optical (MO) recording, double-layered garnet films were investigated. The coercivity of the double-layered garnet film was increased, when the upper layer was crystallized. This increase of the coercivity is caused by the increase of the uniaxial anisotropy energy. The increase of the uniaxial anisotropy energy also leads to a decrease in the noise level of the MO readout signal. As a consequence, the critical diameter of written domains was reduced to 0.2 μm. This critical diameter is smaller than the reading out beam spot for the case with a green laser and a high numerical aperture objective lens. The garnet films are sufficient for high density next generation MO recording.
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