In order to use an integrated optical flying head, we are subjected to develoJ? media in which the M.O.layer is at the surface. Garnets are good candidates but they require the use of an adjacent metallic film as reflecting layer. Chromium was choosen. The garnet/chromium/substrate structure must be annealed up to 600°C to crystallize the garnet which is amorphous sputtered. Microstructural, magnetic and optical properties of this new structure have been studied. Although the metallic film

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... zed, there is no diffusion of chromium in the structure and no modification of the different garnet's parameters. Domains have been written on those media. They exhibit good quality and reproductibility.