Magneto-optical member

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The present invention relates to a magneto-optical member (1) with which a great magneto-optical effect can be obtained. A granular film (6) (granular magneto-optical thin film) is provided between an (SiO2/Ta2O5)n layer (4) and a (Ta2O5/SiO2)n layer (5) to form a magneto-optical member (one-dimensional photonic crystal) (1). The granular film (6) consists of magnetic minute particles made of Co (7) and a matrix (8) which is made of Sm2O3 (a rare earth-oxide) and which surrounds the magnetic minute particles. Co and Sm2O3 are alternately sputtered at a low temperature by utilizing two target sputtering method to form the granular film (6). Thus, the granular film (6) is formed at a low temperature, and hence the disorder of the periodic structure of the (SiO2/Ta2O5)n layer (4) and the (Ta2O5/SiO2)n layer (5) which may be caused during heat treatment at a high temperature does not occur at all. As a result, the magneto-optical member (1) is enabled to show an intense localization of light for the light having a specific wavelength, resulting in showing both a great magneto-optical effect and a high transmissivity.