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US 5,702,831 AGranted
Ferromagnetic GMR material
AssigneeMotorola, Inc.
InventorsEugene Chen, Saied N. Tehrani
Life of this patent
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Abstract
A multi-layer magnetic material (10) has magnetic vectors (21,22) that point along a length (27) of the material (10). Opposing magnetic fields cause the vectors to snap past the perpendicular position with a rapid change in the resistance of the material. The material is used as a memory cell (37,38,39,41) of a memory (36).
Claims15
A ferromagnetically coupled GMR material comprising:
- a plurality of magnetic layers having a width and a length wherein the width is no greater than a transition width and wherein each magnetic layer is ferromagnetically coupled to an adjacent magnetic layer and substantially all magnetic vectors in each layer of the plurality of magnetic layers substantially align along the length;
- and
- a plurality of conductive spacers separating the plurality of magnetic layers.
A multilayer ferromagnetically coupled GMR material comprising:
- a first composite magnetic layer having a first width, a first thickness, and a first length;
- a first conductive spacer layer;
- and
- a second composite magnetic layer having a second width, a second thickness that is greater than the first thickness, and a second length wherein the first conductive spacer layer is between the first and second magnetic layers wherein the first and second widths are no greater than a first transition width and wherein the first and second magnetic layers are ferromagnetically coupled and magnetic vectors in the first and second composite magnetic layers point substantially parallel to the first and second lengths.
1 more element
Dependencies are inferred from the claim text.