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To detect the magnetic field using polarization of a light, transparent magnetic material having a Faraday effect is required. The Co‐MgF2 granular film is promising as a candidate of the Faraday element for the magnetic field sensing. In this study, Fabry–Pérot resonant structure was introduced into the Co‐MgF2 granular film to enhance the Faraday effect. It was found that the Faraday effect per...