Magnetoresistance effect device, magnetic head therewith, magnetic recording/reproducing head, and magnetic storing apparatus
First Claim
1. A magnetoresistance effect device, comprising:
- a substrate having a main surface;
a magnetoresistance effect film composed of a magnetic multi-layer film having at least an antiferromagnetic film, a first ferromagnetic film, a non-magnetic film, and a second ferromagnetic film formed in the order above the main surface portion of the substrate, the magnetic multi-layer film having giant magnetoresistance effect, the second ferromagnetic film disposed in a magnetic field detecting portion;
a pair of bias magnetic field applying films adjacent to the both edge portions of the magnetic field detecting portion, the bias magnetic field applying films disposed on a conductive film selected from the group consisting of the antiferromagnetic film, the first ferromagnetic film, and the nonmagnetic film; and
'"'"'a pair of electrodes for supplying a current to the magnetoresistance, effect film.
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Accused Products
Abstract
A magnetoresistance effect device comprises a magnetic multi-layer film having at least an antiferromagnetic film, a first ferromagnetic film, a non-magnetic film, and a second ferromagnetic film formed in the order on the front surface portion of the substrate, the magnetic multi-layer film having giant magnetoresistance effect, at least the second ferromagnetic film having a shape corresponding to a magnetic field detecting portion. The bias magnetic field applying films are disposed on a conductive film of the magnetic multi-layer film at outer portions of both edge portions of the magnetic field detecting portion of the magnetoresistance effective film. Alternatively, the second ferromagnetic film has a first portion corresponding to the magnetic field detecting portion and a second portion corresponding to the outer portions of both the edge portions of the magnetic field detecting portion, the film thickness-of the second portion being smaller than the film thickness of the first portion. The bias magnetic field applying films are formed at the outer portions of both the edge portions of the magnetic field detecting portion of the second ferromagnetic film. With the reversely structured magnetoresistance effect film and the laminate positions of the bias magnetic field applying films, in addition to suppressing the reproduction fringe and Barkhausen noise, the decrease of contact resistance, the suppression of insulation detect, and good linear response characteristic can be accomplished.
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Citations
26 Claims
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1. A magnetoresistance effect device, comprising:
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a substrate having a main surface;
a magnetoresistance effect film composed of a magnetic multi-layer film having at least an antiferromagnetic film, a first ferromagnetic film, a non-magnetic film, and a second ferromagnetic film formed in the order above the main surface portion of the substrate, the magnetic multi-layer film having giant magnetoresistance effect, the second ferromagnetic film disposed in a magnetic field detecting portion;
a pair of bias magnetic field applying films adjacent to the both edge portions of the magnetic field detecting portion, the bias magnetic field applying films disposed on a conductive film selected from the group consisting of the antiferromagnetic film, the first ferromagnetic film, and the nonmagnetic film; and
'"'"'a pair of electrodes for supplying a current to the magnetoresistance, effect film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 14, 24, 25, 26)
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10. A magnetoresistance effect device, comprising:
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a substrate having a main surface;
a magnetoresistance effect film composed of a magnetic multi-layer film having at least an antiferromagnetic film, a first ferromagnetic film, a non-magnetic film, and a second ferromagnetic film formed in the order above the main surface of said substrate, the magnetic multi-layer film having giant magnetoresistance effect, the second ferromagnetic film having a first portion corresponding to a magnetic field detecting portion and a second portion corresponding to outer portions of both edge portions of the magnetic field detecting portion, the film thickness of the second portion being smaller than the film thickness of the first portion;
a pair of bias magnetic field applying films disposed on the second ferromagnetic film at the outer portions of both the edge portions of the magnetic field detecting portion; and
a pair of electrodes for supplying a current to said magnetoresistance effect films. - View Dependent Claims (11, 12, 13, 15, 16, 17, 18, 20, 21, 22, 23)
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19. A magnetoresistance effect device, comprising:
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a substrate having a main surface;
a magnetoresistance effect film composed of a magnetic multi-layer film having at least an antiferromagnetic film, a first ferromagnetic film, a non-magnetic film, and a second ferromagnetic film formed in the order above the main surface of said substrate, the magnetic multi-layer film having giant magnetoresistance effect, said magnetoresistance effect film having a magnetic field detecting portion;
a pair of bias magnetic field applying films formed on the second ferromagnetic film at outer portions of both edge portions of the magnetic field detecting portion of said magnetoresistance effect film; and
a pair of electrodes for supplying a current to said magnetoresistance effect film.
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Specification