Abstract: The present invention has as an object thereof to provide a semiconductor arithmetic circuit which is capable of conducting edge accentuation processing, edge detection processing, and noise removal by means of averaging processing of an image, using extremely simple circuitry.

Abstract: A magnetic recording medium having a high coercive force of a ferromagnetic metal layer, a high anisotropic magnetic field and/or normalized coercive force, and adaptable to high density recording. The magnetic recording medium includes a substrate body and a ferromagnetic metal layer containing at least Co and Cr formed thereon via a metallic underlying layer of Cr. Magnetic inversion is utilized for the recording. A first region which penetrates through the ferromagnetic metal layer and in which Cr is segregated are formed among the crystal grains constituting the ferromagnetic metal layer. The Cr concentration in the intermediate portions of the first region in the direction of thickness of the ferromagnetic metal layer is smaller than that of the portions near the surface and near the metallic underlying layer.