Abstract: A color image formation apparatus includes a plurality of stages of photosensitive drums provided for respective developing agents, the photosensitive drums arranged in a predetermined direction; and developer units which are provided for respective photosensitive drums and which develop electrostatic latent images formed on the photosensitive drums, wherein an overlap exists in the predetermined direction between a portion of each photosensitive drum and a portion of the developer unit provided so as to correspond to an adjacent photosensitive drum.

Abstract: A magnetic material is provided which includes a discrete phase including grains made of a first substance which comprises a magnetic metal; and a continuous phase including a thin coating film made of a second substance which comprises a dielectric or insulating substance. The thin coating film is formed on the surface of the grains and has a mean thickness smaller than the mean particle size of the grains. The grains are separated substantially from each other by the thin coating film.