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US4945397A Expired / Lapsed US ⏱️ 0.0 years remaining

Resistive overlayer for magnetic films

Assignee: Honeywell Inc
•
Filing: 1989-07-11
•
Granted: 1990-07-31
•
Expires: 2009-07-11
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Abstract

Abstract A magnetic, solid state memory cell or sensor includes a magnetoresistive, ferromagnetic layer and a resistive layer overlying the magnetoresistive layer. The resistivity and dimensions of the resistive layer are such that, preferably, only a small fraction of any sense current flowing through the cell or sensor will flow between input and output contacts by way of the resistive layer, yet the magnitude of the sense current will not be reduced below a desired signal level due to the presence of the resistive layer. The resistive layer is comprised of a material which will not diffuse into the magnetoresistive layer. A compound or mixture of a metal and either nitrogen or oxygen, such as tantalum and nitrogen, is perferred as the resistive layer. It is also preferred that the resistive layer be nonmagnetic.

Inventors

  • 👤 James A. Schuetz

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 11:53
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/14; G11C11/15; H; H10; H10N; H10N50/00; H10N50/10

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 55 words
A magnetic solid state device comprising; a first layer of a ferromagnetic, magnetoresistive material; a second layer of a ferromagnetic, magnetoresistive material; and a third layer interposed between, and in contact with said first and second layers, wherein said third layer prevents exchange coupling between said first and second layers and includes nitrogen doped tantalum.
Claim 2
Dependent Claim 55 words
A magnetic solid state device comprising; a first layer of a ferromagnetic, magnetoresistive material; a second layer of a ferromagnetic, magnetoresistive material; and a third layer interposed between, and in contact with said first and second layers, wherein said third layer prevents exchange coupling between said first and second layers and includes nitrogen doped tantalum.
Claim 3
Dependent Claim 18 words
The device of claim 1 wherein said first and second layers are each comprised of nickel and iron.
Claim 4
Dependent Claim 16 words
The device of claim 1 wherein said first and second layers are each comprised of permalloy.
Claim 5
Dependent Claim 15 words
The device of claim 1 wherein said third layer is less than 100 Å thick.
Claim 6
Dependent Claim 35 words
The device of claim 1 further including a fourth layer of a resistive material, said fourth layer overlying at least in part said first layer, said fourth layer being in contact with said first layer.
Claim 7
Dependent Claim 13 words
The device of claim 5 wherein said fourth layer includes nitrogen doped tantalum.
Claim 8
Dependent Claim 26 words
The device of claim 5 further including first and second electrical contacts connected to first and second locations on the upper surface of said fourth layers.

References Cited (Backward Citations)

JPS57107088A Cited
US4804816A Cited
US4639806A Cited
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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-07-30 1994-01-29 1994-07-31 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-07-30 1998-01-29 1998-07-31 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-07-30 2002-01-29 2002-07-31 $7700.00 Window Closed / Lapsed

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