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US 6,721,147 B2Granted
Longitudinally biased magnetoresistance effect magnetic head and magnetic reproducing apparatus
AssigneeFujitsu Limited
InventorsKenichi Aoshima, Kenji Noma, Junichi Ito
Life of this patent
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Abstract
A magnetoresistance effect magnetic head includes a magnetoresistance effect element having first and second ends. An electrically insulating biasing portion is at ends of the magnetoresistance effect element to apply a longitudinal bias magnetic field to the magnetoresistance effect element and to suppress leakage current at the ends of the magnetoresistance element. The biasing portion can include an intermediate longitudinal bias application layer disposed between a first insulating antiferromagnetic layer and a second layer that can be an antiferromagnetic layer. The bias portion can also be formed as one bias application layer.
Claims39
A magnetoresistance effect magnetic head, comprising:
- a magnetoresistance effect element having a first end and a second end;
- and
- a biasing portion at said first and second ends of said magnetoresistance effect element for applying a longitudinal bias magnetic field to said magnetoresistance effect element, said biasing portion including an intermediate layer disposed between a first layer and a second layer,
- wherein said first layer is an antiferromagnetic layer, said second layer is formed from one of Al2O3 and NiO, and said second layer has a thickness of approximately 30 nm.
1 more element
A magnetoresistance effect magnetic head comprising:
- a magnetoresistance effect element having a first end and a second end;
- and
- a biasing portion at said first and second ends of said magnetoresistance effect element for applying a longitudinal bias magnetic field to said magnetoresistance effect element, said biasing portion including an intermediate layer disposed between a first layer and a second layer;
- wherein said intermediate layer is a soft magnetic material of nickel-zinc- ferrite.
1 more element
A magnetoresistance effect magnetic head, comprising:
- a magnetoresistance effect element having a first end and a second end;
- and
- a biasing portion at said first and second ends of said magnetoresistance effect element for applying a longitudinal bias magnetic field to said magnetoresistance effect element, said biasing portion including an intermediate layer disposed between a first layer and a second layer,
- electrically conductive upper and lower gap materials disposed in contact with a top and a bottom, respectively, of said magnetoresistance effect element;
- electrically conductive upper and lower shields disposed in contact with said upper and said lower gap materials, respectively, and
- a substrate film disposed between said lower gap material and said lower shield, and between said second layer and said lower shield.
3 more elements
A magnetoresistance effect magnetic head, comprising:
- a magnetoresistance effect element having first and second ends and a top and bottom;
- upper and lower conductive gap materials in contact with said top and bottom, respectively, of said magnetoresistance element;
- upper and lower conductive shielding material in contact with said upper and lower gap material, respectively, on sides of said upper and lower gap material opposite from said magnetoresistance element;
- and
- an insulating biasing portion at said first and second ends of said magnetoresistance effect element for applying a longitudinal bias magnetic field to said magnetoresistance effect element and for suppressing current flow at said first and second ends of said magnetoresistance element;
- wherein said biasing portion includes a first layer comprising an insulating longitudinal bias application layer and a second layer comprising an insulating layer in contact with said longitudinal bias application layer;
- and
- said first layer is formed from a metal-oxide hard magnetic film.
5 more elements
A magnetoresistance effect magnetic head, comprising:
- a magnetoresistance effect element having first and second ends and a top and bottom;
- upper and lower conductive gap materials in contact with said top and bottom, respectively, of said magnetoresistance element;
- upper and lower conductive shielding material in contact with said upper and lower gap material, respectively, on sides of said upper and lower gap material opposite from said magnetoresistance element;
- and
- an insulating biasing portion at said first and second ends of said magnetoresistance effect element for applying a longitudinal bias magnetic field to said magnetoresistance effect element and for suppressing current flow at said first and second ends of said magnetoresistance element;
- wherein said magnetoresistance element is an SVMR element having successive films of NiFe, CoFeB, Cu, CoFeB and PdPtMn.
3 more elements
A magnetic recording/reproducing apparatus having at least one magnetic recording medium rotatably mounted therein, comprising:
- an actuator pivotally mounted in said magnetic recording/reproducing apparatus;
- an arm having a proximate end and a distal end, said proximate end being connected to said actuator;
- a suspension having a base end and a mounting portion, said base end being connected to said distal end of said arm;
- a slider attached to said mounting portion;
- and
- a magnetoresistance effect element attached to said slider, said magnetoresistance effect element having first and second ends and a top and a bottom and including,
- upper and lower conductive gap materials in contact with said top and bottom, respectively, of said magnetoresistance element;
- upper and lower conductive shielding material in contact with said upper and lower gap material, respectively, on sides of said upper and lower gap material opposite from said magnetoresistance element;
- and
- an insulating biasing portion at said first and second ends of said magnetoresistance effect element for applying a longitudinal bias magnetic field to said magnetoresistance effect element and for suppressing current flow at said first and second ends of said magnetoresistance element;
- wherein said biasing portion includes a first layer comprising an insulating longitudinal bias application layer and a second layer comprising an insulating layer in contact with said longitudinal bias application layer, and said first layer is formed from a metal-oxide hard magnetic film.
8 more elements
A magnetic recording/reproducing apparatus having at least one magnetic recording medium rotatably mounted therein, comprising:
- an actuator pivotally mounted in said magnetic recording/reproducing apparatus;
- an arm having a proximate end and a distal end, said proximate end being connected to said actuator;
- a suspension having a base end and a mounting portion, said base end being connected to said distal end of said arm;
- a slider attached to said mounting portion;
- and
- a magnetoresistance effect element attached to said slider, said magnetoresistance effect element having first and second ends and a top and a bottom and including,
- upper and lower conductive gap materials in contact with said top and bottom, respectively, of said magnetoresistance element;
- upper and lower conductive shielding material in contact with said upper and lower gap material, respectively, on sides of said upper and lower gap material opposite from said magnetoresistance element;
- and
- an insulating biasing portion at said first and second ends of said magnetoresistance effect element for a in a longitudinal bias magnetic field to said magnetoresistance effect element and for suppressing current flow at said first and second ends of said magnetoresistance element;
- wherein said magnetoresistance element is an SVMR element having successive films of NiFe, CoFeB, Cu, CoFeB and PdPtMn.
8 more elements
A magnetoresistance effect magnetic head, comprising:
- a magnetoresistance effect element having first and second ends and a top and bottom;
- upper and lower conductive gap materials in contact with said top and bottom, respectively, of said magnetoresistance element;
- upper and lower conductive shielding material in contact with said upper and lower gap material, respectively, on sides of said upper and lower gap material opposite from said magnetoresistance element;
- and
- an insulating biasing portion at said first and second ends of said magnetoresistance effect element for applying a longitudinal bias magnetic field to said magnetoresistance effect element and for suppressing current flow at said first and second ends of said magnetoresistance element;
- wherein said insulating biasing portion includes an insulating ferromagnetic layer and a soft magnetic layer in contact with said antiferromagnetic layer.
3 more elements
A magnetoresistance effect magnetic head, comprising:
- a magnetoresistance effect element having first and second ends and a top and bottom;
- upper and lower conductive gap materials in contact with said top and bottom, respectively, of said magnetoresistance element;
- upper and lower conductive shielding material in contact with said upper and lower gap material, respectively, on sides of said upper and lower gap material opposite from said magnetoresistance element;
- and
- an insulating biasing portion at said first and second ends of said magnetoresistance effect element for applying a longitudinal bias magnetic field to said magnetoresistance effect element and for suppressing current flow at said first and second ends of said magnetoresistance element;
- wherein said biasing portion includes an insulating hard magnetic layer.
3 more elements
Dependencies are inferred from the claim text.