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We investigated magnetic and magnetooptical properties of Co-Al magnetic thin films on a nanostructured substrate. The nanostructured substrate was made of polycarbonate by injection molding. The stamper was made by electron beam cutting. The nanostructured substrate contributed a perpendicular magnetic anisotropy component to the film and decreased the reflectance of the film. The Kerr rotation angle on the nanostructured substrate was greater than that on a glass substrate.

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