One of the most important factors for developing magneto-optical storage media is how high coercive-force can achieved. In the case of the coating films consisting of magneto-optical particles, the magnetic features of each particle dominantly determine the coercive-force of the thin films. Compared with the thin films prepared by dry process, the coercive-force of the particle-coating film is likely to become small owing to the low internal stresses due to the particle geometry. Thus another extrinsic effect to increase the coercive-force should be proposed. For this purpose, we have investigated the effect of the particle size on the magnetic properties for the coating films. The technique to control the particle size should be also a key ingredient for the design of high coercivity coating film. In this study, we control the size of the bismuth substituted gadolinium iron garnet (BiGd_2Fe_5O_(12), Bi-GdIG) nanoparticles by heat-treatment technique. A demonstration of the control of particle size and its coercive-force is reported.
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