Abstract
The magnetic and magneto-optical properties of a high Bi-substituted BiGaDylG film and an Al/BiGaDylG double layer film crystallized by the rapid recurrent thermal annealing (RRTA) method have been investigated. An average value of the effective Faraday angle of the double layer is about 0.25 ° more than a single garnet film in any thickness from 0.1 to 1.3 μm at 630 nm wavelength. It is suggested that the strong Faraday effect originates from the garnet film's fine grain size and the action of interfacial optical interference. There is a small saturation magnetization of about 796 (A/m) as well as a high coercivity of about 9.5 × 10 +4 (A/m) for high Bi-substituted garnet films, whilst the Curie point is reduced from 161 °C to 140 °C by diffusing aluminum atom into the garnet film and substituting the Fe +3 ion in octahedral and tetrahedral sites. The results suggest that Al/BiGaDylG double films are promising candidates for short wavelength magneto-optical recording application.
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