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US 5,966,275 AGranted
GMR magnetic sensor having an improved sensitivity of magnetic detection
AssigneeFujitsu Limited
InventorMakoto Iijima
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Abstract
A GMR magnetic sensor includes a lower electrode, a first non-magnetic metal layer formed on the lower electrode and including ferromagnetic regions, a second non-magnetic metal layer on the first non-magnetic metal layer, a third non-magnetic metal layer on the second non-magnetic metal layer and including ferromagnetic regions, and an upper electrode formed on the third non-magnetic metal layer, wherein a tunneling insulation film is disposed further between the first non-magnetic metal layer and the third non-magnetic metal layer.
Claims10
A giant magneto-resistive magnetic sensor, comprising:
- a first electrode;
- a first conductive non-magnetic layer provided on said first electrode;
- a plurality of first ferromagnetic regions formed in said first conductive non-magnetic layer with a mutual separation from each other;
- a second conductive non-magnetic layer provided on said first conductive non-magnetic layer;
- a third conductive non-magnetic layer provided on said second conductive non-magnetic layer;
- a plurality of second ferromagnetic regions formed in said third conductive non-magnetic layer with a mutual separation from each other;
- a second electrode provided on said third conductive non-magnetic layer;
- said first conductive nonmagnetic layer and said third conductive nonmagnetic layer are separated from each other by a distance that causes an exchange interaction between a first ferromagnetic region and a second ferromagnetic region;
- and
- a tunneling insulation film is disposed between said first conductive non-magnetic layer and said third conductive non-magnetic layer.
7 more elements
A magnetic head, comprising:
- a first magnetic shield;
- a second magnetic shield formed on said first magnetic shield, with a read gap formed between said first magnetic shield and said second magnetic shield;
- and
- a GMR magnetic sensor disposed in said read gap, said GMR magnetic sensor comprising:
- a first electrode;
- a first conductive non-magnetic layer provided on said first electrode;
- a plurality of first ferromagnetic regions formed in said first conductive non-magnetic layer with a mutual separation from each other;
- a second conductive non-magnetic layer provided on said first conductive non-magnetic layer;
- a third conductive non-magnetic layer provided on said second conductive non-magnetic layer;
- a plurality of second ferromagnetic regions formed in said third conductive non-magnetic layer with a mutual separation from each other;
- a second electrode provided on said third conductive non-magnetic layer;
- said first conductive nonmagnetic layer and said third conductive nonmagnetic layer are separated from each other by a distance that causes an exchange interaction between a first ferromagnetic region and a second ferromagnetic region;
- and
- a tunneling insulation film is disposed between said first conductive non-magnetic layer and said third conductive non-magnetic layer.
11 more elements
Dependencies are inferred from the claim text.