Hitachi, Ltd.

501 Hitachi, Ltd.

Eiichi Takasuna

Yoshiki Kato

Youichi Kawakubo

Masaaki Imamura

Fuzio Maeda

Keigo Iechika

Masa-aki Imamura

Fillers are mixed into a resin solution used to form a resin layer on the substrate of a magnetic disk. Therefore, the distance from the boundary between the resin layer and magnetic film to the filler top as well as the distance from the surface of the magnetic film to the top of the filler in the magnetic film are freely adjustable by appropriately setting the particle size of mixed fillers, thickness of the resin layer and thickness of magnetic film independently or in combination. Thus, the magnetic disk can be designed with a considerably improved freedom.

Magnetic disk and method of manufacturing same

A magnetic recording medium of the present invention comprises: a substrate; a magnetic film formed on this substrate; and a nonmagnetic reinforcing agent mixed into the magnetic film and projected from the surface of the magnetic film. Assuming that the minimum flying height of the magnetic head which is lifted up over the magnetic film is h, a projection height T of the nonmagnetic reinforcing agent from the surface of the magnetic film satisfies the relation of h/4&lt;T&lt;h. By virtue of this, even if an amount of mixture of the nonmagnetic reinforcing agent which becomes a cause of the generation of the noises is reduced, the necessary durability can be obtained.

Magnetic recording medium

Growing community of inventors

Odawara, Japan

Eiichi Takasuna