International Business Machines Corporation

Erhard Max

Holger Hinkel

Georg Kraus

Ulrich Kuenzel

Gerhard Kaus

Ulrich Kunzel

Jochen Schneider

Annelie Monnich

Michael Glatzel

The magnetic disc comprises a magnetizable layer (1) to which an adhesion promoting layer (4) and thereto a lubricant film (5) are applied. Onto the substrate of the magnetic head (2) an adhesion reducing layer (9) is deposited. The apparatus can also show only one adhesion-influencing layer. The layers (4) and (9) are formed by the reaction of a sililating agent with reactive groups on the surface of the magnetizable layer (1), or of the substrate of the magnetic head (2), respectively. The sililating agents used differ in their terminal groups of which one category produce van der Waals bonds to the lubricant molecules, and the other is chemically indifferent relative to the lubricant molecules. The two layers (4) and (9) are made e.g. by the spin-coating of a solution of the sililating agent, and subsequent drying. The apparatus ensures a homogeneous coating of the magnetizable layer (1) with lubricant, and it prevents the pick-up of lubricant by the substrate of the magnetic head (2).

Apparatus comprising a lubricant-coated magnetic disc and a magnetic

A substrate for a magnetic recording disk employs an annular core of synthetic material having thin metal foils bonded to opposite faces, the metal foils serving to receive a magnetic recording material to form a magnetic recording structure. The inner surfaces of foils which are bonded to the core faces have applied thereto a thin, soft, deformable layer such as copper to prevent irregularities in the core faces from affecting the outer surfaces of the metal foils.

Magnetic disk substrate with a core of synthetic material

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Sindelfingen, Germany

Erhard Max