U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Magnetoresistive memory including thin film storage cells having tapered ends

Patent 4731757 Issued on March 15, 1988. Estimated Expiration Date: Icon_subject June 27, 2006. 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.

Patent References

3117885

3218616

3432832

3466636

3493943

3531780

3576552

3798623

3883858

Reading unit for a magnetic domain propagation register on a thin layer
Patent #: 3996575
Issued on: 12/07/1976
Inventor: Battarel

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Inventors

Assignee

Application

No. 06/879679 filed on 06/27/1986

US Classes:

365/173, Multiple magnetic storage layers365/158Magnetoresistive

Examiners

Primary: Moffitt, James W.

Attorney, Agent or Firm

International Classes

G11C 11/02 (20060101)
G11C 11/15 (20060101)

Abstract

A digital memory based on a memory cell having two magnetoresistive ferromagnetic film portions separated by an intermediate layer all of which are gradually narrowed at the ends thereof.Adjacent memory cells are preferrably arranged in a line with conductive junctions therebetween. The magnetic state of each cell can be sensed or set by providing currents of different magnitudes in conductive word lines which overlie the cells. The narrowed ends of the cells reduce demagnetizing effects which occur if the cell ends are abruptly terminated.

Other References

  • IBM Technical Disclosure Bulletin--vol. 8, No. 11, Apr. 1966; pp. 1613-1614
  • "Magnetoresistive Readout for 200-Nsec TF Memory," Electronic Design, Mar. 15, 1962, p. 31
  • "Magnetoresistive Readout of Thin-film Memories," Digest of Technical Papers, 1962 International Solid-State Circuits Conference, P. Huijer, pp. 36-37
  • "Magnetoresistance in Laminated NiFe films," Journal of Applied Physics, vol. 53, No. 3, Mar. 1982, van Ooyen, et al., pp. 2596-2598
  • "Magnetoresistive Switching of Small Permalloy Sandwich Structures," Journal of Applied Physics, vol. 55, No. 2, Jan. 15, 1984, Berchier, et al., pp. 487-492
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