Tokyo Shibaura Denki Kabushiki Kaisha

Yoshiyasu Koike

Tadashi Ido

Moriyasu Wada

Osamu Kubo

Toshihiko Oguchi

Hirotaka Yokoyama

Akio Ishizawa

Masanobu Uwaha

Disclosed is a magnetic recording medium comprising substrate and a resinous composition containing magnetic particles of uniaxially-anisotropic hexagonal crystals having particle diameters of 0.01.about.0.3 .mu.m and coated on said substrate; the ratio of remanent magnetization to saturation magnetization on the magnetization curve corrected to demagnetizing field which is measured in a direction vertical to the surface of the recording medium, ranging from 0.3 to 0.7. This magnetic recording medium requires no orientation treatment for its production.

Magnetic recording media

A process for manufacturing a hexagonal ferrite magnetic powder for a magnetic recording medium involves rapidly cooling a molten material of a glass-forming component and a hexagonal ferrite-forming component to obtain glass flakes, heating the glass flakes to precipitate ferrite fine grains, incompletely dissolving the glass flakes with an acid or boiling water, and separating and recovering the fine grains in the presence of a dispersing agent.

Process for manufacturing powder for magnetic recording medium

Growing community of inventors

Chigasaki, Japan

Yoshiyasu Koike