Magnetoresistive head and magnetic disk apparatus
First Claim
1. A magnetoresistive head having a magnetoresistive film for converting a magnetic signal to an electric signal utilizing a magnetoresistive effect, a pair of electrodes for supplying a signal detection current to said magnetoresistive film, and a longitudinal bias layer which applies a longitudinal bias field to said magnetoresistive film, wherein said longitudinal bias layer comprises:
- an underlayer composed of one of a ferromagnetic thin film having a crystal structure of a body-centered cell and an antiferromagnetic thin film having a crystal structure of a body-centered cell; and
a hard magnetic thin film which is formed on said underlayer.
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Accused Products
Abstract
A magnetoresistive head in which Barkhausen noise is substantially suppressed and a variation in reproduction is minimized, and a magnetic disk apparatus using the same magnetic head have been provided. The feature of the magnetic head and the magnetic disk apparatus of the invention resides in the provision of the longitudinal bias layer which comprises a hard magnetic thin film formed on an underlayer made of either of a ferromagnetic thin film having a body-centered cubic lattice crystal structure formed of body-centered cells, an amorphous ferromagnetic thin film or antiferromagnetic thin film having a body-centered cubic lattice crystal structure formed of body-centered cells.
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Citations
21 Claims
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1. A magnetoresistive head having a magnetoresistive film for converting a magnetic signal to an electric signal utilizing a magnetoresistive effect, a pair of electrodes for supplying a signal detection current to said magnetoresistive film, and a longitudinal bias layer which applies a longitudinal bias field to said magnetoresistive film, wherein said longitudinal bias layer comprises:
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an underlayer composed of one of a ferromagnetic thin film having a crystal structure of a body-centered cell and an antiferromagnetic thin film having a crystal structure of a body-centered cell; and
a hard magnetic thin film which is formed on said underlayer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A magnetoresistive head having a magnetoresistive film, the electrical resistance of which changes in response to a magnetic field, a transverse bias layer exhibiting a soft magnetic property which impresses a transverse bias field to said magnetoresistive film, a spacer film made of a non-magnetic material which magnetically separates said transverse bias layer and said magnetoresistive film, a longitudinal bias layer which is disposed abutting both sides of a laminated film composed of said magnetoresistive film, said transverse bias layer and said spacer film, and which applies a longitudinal bias field to said magnetoresistive film, and a pair of electrodes which supply a current to said magnetoresistive film, wherein said longitudinal bias layer comprises:
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an underlayer which is made of one of a ferromagnetic thin film, antiferromagnetic thin film and amorphous ferromagnetic thin film; and
a hard magnetic film which is formed on said underlayer, and wherein said transverse bias layer which applies the transverse bias field to said magnetoresistive film comprises;
at least one of Ni—
Fe alloy, Co, Ni—
Fe—
Co alloy; and
at least one of compounds selected from the group of zirconium oxide, aluminum oxide, hafnium oxide, titanium oxide, beryllium oxide, magnesium oxide, tantalum oxide, rare-earth oxide compound, zirconium nitride, hafnium nitride, alumininum nitride, and rare earth nitride compound. - View Dependent Claims (14, 15, 16, 17)
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- 18. A magnetic disk apparatus having a magnetic recording medium for recording information, a magnetic head for reading and writing said information, said head having a magnetoresistive element having a longitudinal bias layer provided by forming a hard magnetic thin film on an underlayer made of one of a ferromagnetic thin film having a crystal structure of a body-centered cell and an antiferromagnetic thin film having a crystal structure of a body-centered cell, an actuator for moving said magnetic head to a position designated on said magnetic recording medium, and a controller for controlling transmission and reception of said information during reading and writing using said magnetic head and for controlling movement of said actuator.
Specification