US 6,665,141 B2 · Magnetic head having track width defined by trench portions filled with magnetic shield material

Abstract

In a composite magnetic head comprising a magnetoresistive read head including a magnetic thin film having a magnetoresistive effect and soft magnetic members interposing the soft magnetic film between them through a non-magnetic insulation layer, an induction type write head including poles formed in a moving direction of a medium and a conductor crossing the poles, and disposed in the proximity of the magnetoresistive head, and a substrate supporting these heads, the present invention discloses a composite magnetic head characterized in that part of a floating surface inclusive of the magnetic head constituent members has recesses and the read/write operations to and from the medium are effected by the portion interposed by these recesses.

Claims5

Dependent claims

A magnetic head comprising:

a reproducing head including a magnetoresistive sensor and a write head including an upper magnetic pole formed over a gap layer and a lower magnetic pole formed under the gap layer, wherein trench portions or recessed portions are formed in surfaces facing a magnetic disk medium of said reproducing head and write head,
said trench or recessed portions are filled with a magnetic shield material,
widths of said upper magnetic pole and lower magnetic pole are defined by said trench or recessed portions filled with the magnetic shield material, and
a track width of said reproducing head is defined by said trench portions or recessed portions filled with the magnetic shield material.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

10/340,785Filed 13 Jan 2003 · continuation

Priority

JP 02-09765916 Apr 1990

Published

US 2003/0099063 A129 May 2003

Granted

16 Dec 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

G11B 5/3903
Using magneto-resistive devices or effects: using magnetic thin film layers or their effects, the films being part of integrated structures
G11B 5/1278
Structure or manufacture of heads, e.g. inductive: specially adapted for magnetisations perpendicular to the surface of the record carrier
G11B 5/1871
Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap…:…
G11B 5/3103
Using thin films: structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing

Family

Application07/683,719Parent of this continuation · filed 11 Apr 1991

Application08/192,794Parent of this division · filed 7 Feb 1994

Application09/084,321Parent of this continuation · filed 26 May 1998

Application09/598,491Parent of this continuation · filed 22 Jun 2000

Application10/083,104Parent of this continuation · filed 27 Feb 2002

US 2003/0099063 A1Pre-grant publication · published 29 May 2003

US 6,538,844 B2Parent of this continuation

US 6,111,723 AParent of this continuation

Application09/084,321Parent of this division

US 5,850,326 AParent of this division

Application08/192,794Parent of this continuation

US 2002/0080521 A1Published application

US 6,665,141 B2This patent

From the US filing history. Foreign family members aren’t listed.

Magnetic head having track width defined by trench portions filled with magnetic shield material

Life of this patent

Magnetic head having track width defined by trench portions filled with magnetic shield material

Life of this patent

Abstract

Claims5