Digital Equipment Corporation

Kazuo Ishibashi

Michael L Mallary

Hiroshi Sato

Takahiro Mori

An apparatus for providing radial uniaxial anisotropy in the soft magnetic layer of a magnetic recording disk is disclosed. While the soft magnetic layer is being deposited on the recording disk, the magnetic field. The alternating perpendicular magnetic field causes eddy currents to flow in the disk, in a circumferential direction. The eddy currents, in turn cause a magnetic field in a radial direction, thereby resulting in the desired radial uniaxial anisotropy.

Apparatus for providing uniaxial anisotropy in a magnetic recording disk

A method for treating the surface of a solid to impart a desired degree of roughness by forming a large number of tiny indented points is disclosed. First, a large number of tiny liquid droplets is dispersed all over the surface of the solid. Then, a layer of a diluted solution of plastic dissolved in a volatile solvent is formed on the surface, covering the droplets. After the volatile solvent has evaporated, a plastic film containing a large number of tiny holes is formed on the surface of the solid. Etching is then done on the surface using the said plastic film as a mask, thus, a large number of tiny indented points are formed on the surface of the solid.

Methods for treating the surface of a solid body

A method and apparatus for providing radial uniaxial anisotropy in the soft magnetic layer of a magnetic recording disk is disclosed. While the soft magnetic layer is being deposited on the recording disk, the magnetic field. The alternating perpendicular magnetic field causes eddy currents to flow in the disk, in a circumferential direction. The eddy currents, in turn cause a magnetic field in a radial direction, thereby resulting in the desired radial uniaxial anisotropy.

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Matsudo, Japan

Kazuo Ishibashi