Magnetic recording medium, method of manufacture thereof, and magnetic recorder
First Claim
1. A magnetic recording medium comprising:
- a substrate;
a magnetic layer which records information; and
a crystalline underlying layer which is positioned between the substrate and the magnetic layer, wherein;
the underlying layer is formed by generating plasma by resonance absorption, colliding the generated plasma with a target to sputter target particles, and depositing the sputtered target particles on the substrate while introducing the sputtered target particles onto the substrate by applying a bias voltage between the substrate and the target.
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Abstract
A magnetic recording medium of the present invention comprises an MgO layer 2, a first control layer 3, a second control layer 4, a magnetic layer 5, and a protective layer 6 which are provided in this order on a substrate 1. The MgO layer is formed by means of the ECR sputtering method. Accordingly, this layer is crystallized in the hexagonal system, and crystals are successfully oriented in a certain azimuth. Two or more layers of metal control layers are formed on the MgO layer by using materials and compositions so that the difference in lattice constant with respect to the magnetic layer is not more than 5%. Owing to the presence of the control layers, the magnetic layer is epitaxially grown in a well-suited manner while reflecting the structure of the MgO layer, making it possible to realize the orientation of (11.0) of Co which is preferred to perform the high density recording in the magnetic layer. Accordingly, it is possible to provide the magnetic recording medium capable of performing the super high density recording exceeding 40 Gbits/inch2.
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Citations
89 Claims
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1. A magnetic recording medium comprising:
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a substrate;
a magnetic layer which records information; and
a crystalline underlying layer which is positioned between the substrate and the magnetic layer, wherein;
the underlying layer is formed by generating plasma by resonance absorption, colliding the generated plasma with a target to sputter target particles, and depositing the sputtered target particles on the substrate while introducing the sputtered target particles onto the substrate by applying a bias voltage between the substrate and the target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89)
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65. The magnetic recording medium according to claim, wherein the magnetic layer is formed of a material containing a major component of Co, and the magnetic layer has a crystal structure of hexagonal close-packed lattice (hcp).
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73. A method for producing a magnetic recording medium, wherein the magnetic recording medium comprises:
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a substrate;
a magnetic layer which records information; and
a crystalline underlying layer which is positioned between the substrate and the magnetic layer, the method comprising;
generating plasma by resonance absorption;
colliding the generated plasma with a target to sputter target particles; and
depositing the sputtered target particles on the substrate while introducing the sputtered target particles onto the substrate by applying a bias voltage between the substrate and the target to form the underlying layer. - View Dependent Claims (74, 75, 76, 77, 78, 79)
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Specification