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US 2005/0237677 A1Published application
Thin film magnetic head, head gimbal assembly, and hard disk drive
AssigneeTDK Corporation
InventorsKoji Shimazawa, Kosuke Tanaka, Tomoaki Shimizu
Life of this patent
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Abstract
Both end portions of a magneto-resistive effect film form a junction taper shape and, at both end portions forming the junction taper shape, a pair of bias magnetic field applying layers are disposed via underlayers for applying a longitudinal bias magnetic field to a soft magnetic layer. Each of the underlayers is formed by a thin film made of at least one element selected from a group of Ru, Ti, Zr, Hf, and Zn or an alloy thin film containing, as a main component, at least one element selected from the group. Each of the bias magnetic field applying layers formed on the underlayers is formed by a hard magnetic layer and has a thickness of 200 Å or less (not including zero).
Claims21
A thin film magnetic head comprising a magneto-resistive effect element having a magneto-resistive effect film,
- wherein said magneto-resistive effect film is a multilayer film comprising a nonmagnetic layer, a ferromagnetic layer formed on one surface of said nonmagnetic layer, a soft magnetic layer formed on the other surface of said nonmagnetic layer, and a pinning layer formed so as to contact with one surface of said ferromagnetic layer (a surface of said ferromagnetic layer opposite to a surface thereof contacting with said nonmagnetic layer) for pinning a magnetization direction of said ferromagnetic layer,
- wherein both end portions of said magneto-resistive effect film form a junction taper shape and, at said both end portions forming the junction taper shape, a pair of bias magnetic field applying layers are disposed via underlayers for applying a longitudinal bias magnetic field to said soft magnetic layer,
- wherein each of said underlayers is formed by a thin film made of at least one element selected from the group consisting of Ru, Ti, Zr, Hf, and Zn or an alloy thin film containing, as a main component, at least one element selected from said group, and
- wherein each of said bias magnetic field applying layers formed on said underlayers is formed by a hard magnetic layer and has a thickness of 200 Å or less (not including zero).
1 more element
A thin film magnetic head comprising a magneto-resistive effect element having a magneto-resistive effect film,
- wherein said magneto-resistive effect film is a multilayer film comprising a nonmagnetic layer, a ferromagnetic layer formed on one surface of said nonmagnetic layer, a soft magnetic layer formed on the other surface of said nonmagnetic layer, and a pinning layer formed so as to contact with one surface of said ferromagnetic layer (a surface of said ferromagnetic layer opposite to a surface thereof contacting with said nonmagnetic layer) for pinning a magnetization direction of said ferromagnetic layer,
- wherein both end portions of said magneto-resistive effect film form a junction taper shape and, at said both end portions forming the junction taper shape, a pair of first bias magnetic field applying layers are disposed via first underlayers for applying a longitudinal bias magnetic field to said soft magnetic layer, while, a pair of second bias magnetic field applying layers are disposed on said first bias magnetic field applying layers via second underlayers for applying a longitudinal bias magnetic field to said soft magnetic layer,
- wherein each of said first underlayers is formed by a thin film made of at least one element selected from the group consisting of Ru, Ti, Zr, Hf, and Zn or an alloy thin film containing, as a main component, at least one element selected from said group,
- wherein each of said second underlayers is formed by a thin film made of a material selected from the group consisting of Cr, CrTi, NiCr, TiW, FeCo, and FeCoMo, and
- wherein each of said first and second bias magnetic field applying layers is formed by a hard magnetic layer.
2 more elements
A head gimbal assembly comprising:
- a slider including a thin film magnetic head and disposed so as to confront a recording medium;
- and
- a suspension elastically supporting said slider,
- wherein said thin film magnetic head comprises a magneto-resistive effect element having a magneto-resistive effect film,
- wherein said magneto-resistive effect film is a multilayer film comprising a nonmagnetic layer, a ferromagnetic layer formed on one surface of said nonmagnetic layer, a soft magnetic layer formed on the other surface of said nonmagnetic layer, and a pinning layer formed so as to contact with one surface of said ferromagnetic layer (a surface of said ferromagnetic layer opposite to a surface thereof contacting with said nonmagnetic layer) for pinning a magnetization direction of said ferromagnetic layer,
- wherein both end portions of said magneto-resistive effect film form a junction taper shape and, at said both end portions forming the junction taper shape, a pair of bias magnetic field applying layers are disposed via underlayers for applying a longitudinal bias magnetic field to said soft magnetic layer,
- wherein each of said underlayers is formed by a thin film made of at least one element selected from the group consisting of Ru, Ti, Zr, Hf, and Zn or an alloy thin film containing, as a main component, at least one element selected from said group, and
- wherein each of said bias magnetic field applying layers formed on said underlayers is formed by a hard magnetic layer and has a thickness of 200 Å or less (not including zero).
5 more elements
A hard disk drive comprising:
- a slider including a thin film magnetic head and disposed so as to confront a disc-shaped recording medium driven to be rotated;
- and
- a positioning device supporting said slider and positioning said slider relative to said recording medium,
- wherein said thin film magnetic head comprises a magneto-resistive effect element having a magneto-resistive effect film,
- wherein said magneto-resistive effect film is a multilayer film comprising a nonmagnetic layer, a ferromagnetic layer formed on one surface of said nonmagnetic layer, a soft magnetic layer formed on the other surface of said nonmagnetic layer, and a pinning layer formed so as to contact with one surface of said ferromagnetic layer (a surface of said ferromagnetic layer opposite to a surface thereof contacting with said nonmagnetic layer) for pinning a magnetization direction of said ferromagnetic layer,
- wherein both end portions of said magneto-resistive effect film form a junction taper shape and, at said both end portions forming the junction taper shape, a pair of bias magnetic field applying layers are disposed via underlayers for applying a longitudinal bias magnetic field to said soft magnetic layer,
- wherein each of said underlayers is formed by a thin film made of at least one element selected from the group consisting of Ru, Ti, Zr, Hf, and Zn or an alloy thin film containing, as a main component, at least one element selected from said group, and
- wherein each of said bias magnetic field applying layers formed on said underlayers is formed by a hard magnetic layer and has a thickness of 200 Å or less (not including zero).
5 more elements
A head gimbal assembly comprising:
- a slider including a thin film magnetic head and disposed so as to confront a recording medium;
- and
- a suspension elastically supporting said slider,
- wherein said thin film magnetic head comprises a magneto-resistive effect element having a magneto-resistive effect film,
- wherein said magneto-resistive effect film is a multilayer film comprising a nonmagnetic layer, a ferromagnetic layer formed on one surface of said nonmagnetic layer, a soft magnetic layer formed on the other surface of said nonmagnetic layer, and a pinning layer formed so as to contact with one surface of said ferromagnetic layer (a surface of said ferromagnetic layer opposite to a surface thereof contacting with said nonmagnetic layer) for pinning a magnetization direction of said ferromagnetic layer,
- wherein both end portions of said magneto-resistive effect film form a junction taper shape and, at said both end portions forming the junction taper shape, a pair of first bias magnetic field applying layers are disposed via first underlayers for applying a longitudinal bias magnetic field to said soft magnetic layer, while, a pair of second bias magnetic field applying layers are disposed on said first bias magnetic field applying layers via second underlayers for applying a longitudinal bias magnetic field to said soft magnetic layer,
- wherein each of said first underlayers is formed by a thin film made of at least one element selected from the group consisting of Ru, Ti, Zr, Hf, and Zn or an alloy thin film containing, as a main component, at least one element selected from said group,
- wherein each of said second underlayers is formed by a thin film made of a material selected from the group consisting of Cr, CrTi, NiCr, TiW, FeCo, and FeCoMo, and
- wherein each of said first and second bias magnetic field applying layers is formed by a hard magnetic layer.
6 more elements
A hard disk drive comprising:
- a slider including a thin film magnetic head and disposed so as to confront a disc-shaped recording medium driven to be rotated;
- and
- a positioning device supporting said slider and positioning said slider relative to said recording medium,
- wherein said thin film magnetic head comprises a magneto-resistive effect element having a magneto-resistive effect film,
- wherein said magneto-resistive effect film is a multilayer film comprising a nonmagnetic layer, a ferromagnetic layer formed on one surface of said nonmagnetic layer, a soft magnetic layer formed on the other surface of said nonmagnetic layer, and a pinning layer formed so as to contact with one surface of said ferromagnetic layer (a surface of said ferromagnetic layer opposite to a surface thereof contacting with said nonmagnetic layer) for pinning a magnetization direction of said ferromagnetic layer,
- wherein both end portions of said magneto-resistive effect film form a junction taper shape and, at said both end portions forming the junction taper shape, a pair of first bias magnetic field applying layers are disposed via first underlayers for applying a longitudinal bias magnetic field to said soft magnetic layer, while, a pair of second bias magnetic field applying layers are disposed on said first bias magnetic field applying layers via second underlayers for applying a longitudinal bias magnetic field to said soft magnetic layer,
- wherein each of said first underlayers is formed by a thin film made of at least one element selected from the group consisting of Ru, Ti, Zr, Hf, and Zn or an alloy thin film containing, as a main component, at least one element selected from said group,
- wherein each of said second underlayers is formed by a thin film made of a material selected from the group consisting of Cr, CrTi, NiCr, TiW, FeCo, and FeCoMo, and
- wherein each of said first and second bias magnetic field applying layers is formed by a hard magnetic layer.
6 more elements
Dependencies are inferred from the claim text.