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US 5,969,910 AGranted
Magnetic head and magnetic disk apparatus provided therewith
AssigneeHitachi, Ltd.
InventorsTakao Imagawa, Shigeru Tadokoro, Yasunari Tajima, Hiroshi Kamio
Life of this patent
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Abstract
A magnetic head having a magnetoresistive head having a spin valve structure in which a composite magnetic layer of a rotatable magnetizing direction layer and oxide or the like is used for a lower shielding layer and/or an upper shielding layer and a magnetic disk apparatus using such a head are disclosed. According to the invention, a magnetic head having a head of a magnetoresistance effect type generating a high output with low noises and a magnetic disk apparatus having a large quantity with high recording density can be realized.
Claims24
A magnetic head comprising:
- a magnetoresistive head having:
- a sensor part including a magnetoresistive film for converting a magnetic signal to an electric signal by using the magnetoresistive effect generated by a relative angle between magnetizing directions of at least two magnetic layers and a pair of electrodes for flowing a signal detection current to the magnetoresistive film;
- and lower and upper magnetic shielding layers for sandwiching the sensor part and forming a magnetic gap layer;
- and
- a head for recording formed on the upper magnetic shielding layer of the magnetoresistive head,
- wherein a material in which activation energy required to change magnetic anisotropy is 1.8 eV or less is used at least in a part of the lower magnetic shielding layer.
3 more elements
A magnetic head comprising:
- a magnetoresistive head having:
- a sensor part which includes a magnetoresistive film for converting a magnetic signal to an electric signal by using the magnetoresistive effect generated by a relative angle between magnetizing directions of at least two magnetic layers, a pair of electrodes for flowing a signal detection current to the magnetoresistive film, and a magnetic domain control layer for making the magnetoresistive film a single magnetic domain;
- and lower and upper magnetic shielding layers for sandwiching the sensor part and forming a magnetic gap layer;
- and
- a head for recording formed on the upper magnetic shielding layer of the magnetoresistive head,
- wherein a material in which activation energy required to change magnetic anisotropy is 1.8 eV or less is used at least in a part of the lower magnetic shielding layer.
3 more elements
A magnetic head comprising:
- a magnetoresistive head having:
- a sensor part including a magnetoresistive film for converting a magnetic signal to an electric signal by using the magnetoresistance effect generated by a relative angle between magnetizing directions of at least two magnetic layers, and a pair of electrodes for flowing a signal detection current to the magnetoresistive film;
- and lower and upper magnetic shielding layers for sandwiching the sensor part and forming a magnetic gap layer;
- and
- a head for recording formed on the upper magnetic shielding layer of the magnetoresistive head,
- wherein a composite magnetic film in which 2 to 10 mol % of oxide or nitride is added to a rotatable magnetizing direction material is used at least in a part of the lower magnetic shielding layer.
3 more elements
A magnetic head comprising:
- a magnetoresistive head having:
- a sensor part including a magnetoresistive film for converting a magnetic signal to an electric signal by using the magnetoresistance effect generated by a relative angle between magnetizing directions of at least two magnetic layers, a pair of electrodes for flowing a signal detection current to the magnetoresistive film, and a magnetic domain control layer for making the magnetoresistive film a single magnetic domain;
- and lower and upper magnetic shielding layers for sandwiching the sensor part and forming a magnetic gap layer;
- and
- a head for recording formed on the upper magnetic shielding layer of the magnetoresistive head,
- wherein a composite magnetic film in which 2 to 10 mol % of oxide or nitride is added to a rotatable magnetizing direction material is used at least in a part of the lower magnetic shielding layer.
3 more elements
A magnetic disk apparatus comprising:
- a magnetic disk;
- a magnetic head for recording or reproducing signals to/from the magnetic disk, having:
- a magnetoresistive head which includes a sensor part having a magnetoresistive film for converting a magnetic signal to an electric signal by using the magnetoresistance effect generated by a relative angle between magnetizing directions of at least two magnetic layers and a pair of electrodes for flowing a signal detection current to the magnetoresistive film, and lower and upper magnetic shielding layers for sandwiching the sensor part and forming a magnetic gap layer;
- and a head for recording formed on the upper magnetic shielding layer of the magnetoresistive head,
- wherein a material in which activation energy required to change magnetic anisotropy is 1.8 eV or less is used at least in a part of the lower magnetic shielding layer.
2 more elements
A magnetic disk apparatus comprising:
- a magnetic disk;
- and
- a magnetic head for recording or reproducing signals to/from the magnetic disk, having:
- a magnetoresistive head which includes a sensor part having a magnetoresistive film for converting a magnetic signal to an electric signal by using the magnetoresistance effect generated by a relative angle between magnetizing directions of at least two magnetic layers, a pair of electrodes for flowing a signal detection current to the magnetoresistance effect film, and a magnetic domain control layer for making the magnetoresistive film a single magnetic domain, and lower and upper magnetic shielding layers for sandwiching the sensor part and forming a magnetic gap layer;
- and a head for recording formed on the upper magnetic shielding layer of the magnetoresistive head,
- wherein a material in which activation energy required to change magnetic anisotropy is 1.8 eV or less is used at least in a part of the lower magnetic shielding layer of the magnetic head.
3 more elements
A magnetic disk apparatus comprising:
- a magnetic disk;
- and
- a magnetic head for recording or reproducing signals to/from the magnetic disk, having:
- a magnetoresistive head which includes a sensor part having a magnetoresistive film for converting a magnetic signal to an electric signal by using magnetoresistance effect generated by a relative angle between magnetizing directions of at least two magnetic layers and a pair of electrodes for flowing a signal detection current to the magnetoresistive film, and lower and upper magnetic shielding layers for sandwiching the sensor part and forming a magnetic gap layer;
- and a head for recording formed on the upper magnetic shielding layer of the magnetoresistive head,
- wherein a composite magnetic film in which 2 to 10 mol % of oxide or nitride is added to a rotatable magnetizing direction material is used at least in a part of the lower magnetic shielding layer of the magnetic head.
3 more elements
A magnetic disk apparatus comprising:
- a magnetic disk;
- and
- a magnetic head for recording or reproducing signals to/from the magnetic disk, having:
- a magnetoresistive head which includes a sensor part having a magnetoresistive film for converting a magnetic signal to an electric signal by using the magnetoresistance effect generated by a relative angle between magnetizing directions of at least two magnetic layers, a pair of electrodes for flowing a signal detection current to the magnetoresistive film, and a magnetic domain control layer for making the magnetoresistive film a single magnetic domain, and lower and upper magnetic shielding layers for sandwiching the sensor part and forming a magnetic gap layer;
- and a head for recording formed on the upper magnetic shielding layer of the magnetoresistive head,
- wherein a composite magnetic film in which 2 to 10 mol % of oxide or nitride is added to a rotatable magnetizing direction material is used at least in a part of the lower magnetic shielding layer of the magnetic head.
3 more elements
Dependencies are inferred from the claim text.