Magnetic head comprising a laminated magnetic layer structure between non magnetic rock salt structure oxide substrates

Patent 5231555 Issued on July 27, 1993. Estimated Expiration Date:

September 20, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Non-magnetic substrate material
Patent #: 4540638
Issued on: 09/10/1985
Inventor: Sakakihara , et al.

Thin film magnetic head having a sliding surface Patent #: 4649448
Issued on: 03/10/1987
Inventor: Nakajima

Inventors

Assignee

Nippon Mining Co., Ltd.

Application

No. 762994 filed on 09/20/1991

US Classes:

360/126, Laminated360/127, Nonmetallic428/813, Substrate composition428/900MAGNETIC FEATURE

Examiners

Primary: Thibodeau, Paul J.
Assistant: Resan, Stevan A.

Attorney, Agent or Firm

Armstrong, Westerman, Hattori, McLeland & Naughton

Foreign Patent References

59-172703 JP. 09/21/1984

International Class

G11B 005/14

Foreign Application Priority Data

1988-02-25 JP

Abstract

A non-magnetic substrate used for a magnetic head comprising a pair of non-magnetic substrates, and a magnetic layer structure sandwiched between the pair of non-magnetic substrates. The magnetic layer structure is comprised, of alternately laminated magnetic layers and intermediate insulating layers. The invention discloses for the substrate material a composition expressed by Znx My Co2-x-y O2, with the proviso that M is Mn or Ni, 0ࣘxࣘ0.4, 0.4ࣘyࣘ1.0, 0.8ࣘx+yࣘ1.0, or Cox Ni2-x O2, with the proviso that 0.2ࣘx ࣘ1.8, and having a rock-salt structure.