Magnetoresistive head and magnetic storage apparatus
First Claim
Patent Images
1. A magnetic head comprising:
- a substrate;
a lower shield formed above said substrate;
a magnetoresistive film formed above said lower shield, said magnetoresistive film including;
pinned layers;
a non-magnetic layer; and
free layers; and
an upper shield formed above said magnetoresistive film, current flowing between said lower shield and said upper shield, wherein said lower shield has a stacked structure comprising a first lower shield formed on a side thereof, adjacent to said substrate, a crystalline reset layer, and a second lower shield formed on a side thereof, adjacent to said magnetoresistive film, said crystalline reset layer comprising an amorphous layer,wherein said amorphous layer is composed ofan AlZr alloy, orone element selected from the group consisting of Hf or Zr, oran alloy containing the Hf or Zr as the main constituent thereof.
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Abstract
Embodiments in accordance with the present invention provide a Current Perpendicular to the Plane—Giant Magnetoresistive (CPP-GMR) head exhibiting a high magnetoresistance (MR) ratio with a low area-resistance product. A lower shield is made up of a first shield layer/a crystalline reset layer/a second shield layer, and an amorphous material is used in at least a part of the crystalline reset layer, thereby controlling crystallinity of the second lower shield/the CPP-GMR head.
22 Citations
18 Claims
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1. A magnetic head comprising:
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a substrate; a lower shield formed above said substrate; a magnetoresistive film formed above said lower shield, said magnetoresistive film including; pinned layers; a non-magnetic layer; and free layers; and an upper shield formed above said magnetoresistive film, current flowing between said lower shield and said upper shield, wherein said lower shield has a stacked structure comprising a first lower shield formed on a side thereof, adjacent to said substrate, a crystalline reset layer, and a second lower shield formed on a side thereof, adjacent to said magnetoresistive film, said crystalline reset layer comprising an amorphous layer, wherein said amorphous layer is composed of an AlZr alloy, or one element selected from the group consisting of Hf or Zr, or an alloy containing the Hf or Zr as the main constituent thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of manufacturing a magnetic head comprising the steps of:
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forming a crystalline reset layer above a substrate; forming a bottom shield above said crystalline reset layer; forming a magnetoresistive film above said bottom shield; and forming an upper shield above said magnetoresistive film, wherein during said forming of said crystalline reset layer to said forming of said magnetoresistive film the process is maintained in vacuum condition. - View Dependent Claims (14)
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9. A method of manufacturing a magnetic head comprising the steps of:
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forming a first shield as a part of a lower shield on a substrate; planarizing a surface of said first shield; forming a crystalline reset layer above the top of said first shield; forming a second shield above the top of said crystalline reset layer; forming a magnetoresistive film above said second shield; and forming an upper shield above said magnetoresistive film, wherein a manufacturing process is executed in a vacuum chamber while maintaining a high degree of vacuum from the step of forming said crystalline reset layer up to the step of forming said magnetoresistive film. - View Dependent Claims (10, 11, 12, 13)
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15. A magnetic head comprising:
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a substrate; a crystalline reset layer formed above said substrate; a bottom shield formed above said crystalline reset layer; a magnetoresistive film formed above said bottom shield, said magnetoresistive film includes a pinned layer, a non-magnetic layer, and free layer; and an upper shield formed above said magnetoresistive film, current flowing between said bottom shield and said upper shield, wherein said magnetoresistive film and said bottom shield has a direct contact, wherein said crystalline reset layer includes an amorphous layer and a crystalline control layer formed above said amorphous layer, and controls crystalline orientation of said bottom layer and said magnetoresistive film, wherein said amorphous layer is composed of an AlZr alloy, or one element selected from the group consisting of Hf or Zr, or an alloy containing the Hf or Zr as the main constituent thereof. - View Dependent Claims (16, 17, 18)
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Specification