Abstract
Recently, Bi-substituted yttrium iron garnet has been used as an indicator that visualizes magnetic flux distribution utilizing magneto-optical (MO) effect. In order to improve the sensitivity and the spatial resolution in the MO imaging, higher Bi substitution and thinness less than 1μm are required. For the purpose, Y3−xBixFe5O12 (Bi:YIG) films with high Bi substitution of x=1.0 – 2.5 were obtained on Gd3Ga5O12 (111) substrates by metal-organic decomposition method in this study. Magneto-optical spectra were measured for all samples, and Faraday rotation was found to be 1.55 × 105 degree/cm at wavelength of 524 nm for x = 2.5 film. For the spatial resolution, magnetic recording marks with a length of 0.6 μm was clearly resolved by using 200 nm-thick Bi:YIG with x = 2.5.
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