International Business Machines Corporation

Muhammad Inayet Ullah

James K Howard

Richard H Ahlert

Richard Donald Umphress

Charles Allan Brown

Michael Andrew Parker

Mark Anthony Church

Herman Russell Wendt

Michael Paul Salo

John Martin Burns

Annayya P Deshpande

Alain M Desouches

Holavanahally Seshachar Nagaraj

Todd L Hylton

Leo Volpe

George S Pal

James Joseph O'Neill

A method of degassing a disk drive component including heating the drive component to a temperature ranging from about 70.degree. C. to 250.degree. C.; subjecting the drive component to vacuum pressure during heating, the vacuum pressure having a first pressure and a second pressure; and monitoring the vacuum pressure to determine the level of degassing of the disk drive component.

Vacuum baking process

A significantly thinner boron carbide overcoat layer is provided for a magnetic disk which has the same durability as thicker prior art overcoat layers for protecting an underlying magnetic layer. By employing adhesion layers selected from the group consisting of Ge, Ru, WTiSi, WTi, Si, and Y between the magnetic layer and the overcoat layer, the durability of the overcoat layer is significantly increased over a single overcoat layer of B4C. Certain process steps in the making of the B4C overcoat layer still further enhance the durability of the B4C overcoat layer by maintaining the disk or substrate specimen at a floating potential in a plasma chamber and employing low levels of argon pressure and sputtering wattage.

Method of making magnetic disk with boron carbide overcoat layer and

Magnetic disk with boron carbide overcoat layer

A high-density recording media comprising longitudinally oriented polycrystalline barium ferrite exhibits large coercivity, corrosion resistance, high hardness and durability. Films are prepared by on-axis sputtering at ambient temperatures from stoichiometric targets followed by a post-deposition anneal at approximately 850.degree.C. to induce crystallization. Crystallization yields a magnetic film with large in-plane remanence and a fine scale texturing that greatly improves the tribological performance of barium ferrite disks. Exceptional durability can be achieved on disks without overcoats. Grain sizes as small as 200 .ANG. are produced by doping with small amounts of Cr.sub.2 O.sub.3 or other additives. Coercivities greater than 4000 Oe are achieved even in small grain films.

Barium ferrite thin film for longitudinal recording

A lapping control system for a row of thin film magnetic transducers formed on a substrate. Each of the magnetic transducers comprises a magnetoresistive (MR) element, and the row is supported on a holder which has an elongated H-shaped slot near one edge to form a beam member upon which the row is mounted. The beam member is capable of being deflected in a substantially quadratic curvature when subjected to pressure from a pressure transducer at the middle of the beam member. The resistance of each of the MR elements is measured during lapping, and a control signal is generated to control the pressure transducers to control lapping with proper BALANCE and BOW and to terminate lapping when the desired MR element height is reached.

Lapping control system for magnetic transducers

Growing community of inventors

Morgan Hill, CA, United States of America

Muhammad Inayet Ullah