Magnetic recording medium, information storage device, and method of manufacturing magnetic recording medium
AssigneeShowa Denko K.K.
InventorYuuki Yoshida
Life of this patent
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Abstract
A magnetic recording medium includes a magnetic recording layer. The magnetic recording layer includes a first magnetic layer formed as a pattern portion that is a data portion in a servo region, a second magnetic layer formed as a non-pattern portion that is magnetized to be antiparallel with a magnetization direction of the first magnetic layer and of which coercive force is lower than a coercive force of the first magnetic layer, and a nonmagnetic layer formed between the first magnetic layer and the second magnetic layer.
Claims5
A magnetic recording medium comprising a magnetic recording layer that includes:
- a first magnetic layer formed as a pattern portion that is a data portion in a servo region;
- a second magnetic layer formed as a non-pattern portion that is magnetized to be antiparallel with a magnetization direction of the first magnetic layer and of which coercive force is lower than a coercive force of the first magnetic layer;
- and
- a nonmagnetic layer formed between the first magnetic layer and the second magnetic layer,
- wherein the nonmagnetic layer is formed of Ru.
An information storage device comprising:
- a magnetic recording medium including a magnetic recording layer that includes a first magnetic layer formed as a pattern portion that is a data portion in a servo region, a second magnetic layer formed as a non-pattern portion that is magnetized so as to be antiparallel with a magnetization direction of the first magnetic layer and of which coercive force is lower than a coercive force of the first magnetic layer, and a nonmagnetic layer formed between the first magnetic layer and the second magnetic layer, wherein the nonmagnetic layer is formed of Ru;
- and
- a magnetic head that performs data reading/writing processing on the magnetic recording medium.
A method of manufacturing a magnetic recording medium,
- the magnetic recording medium comprising a magnetic recording layer that includes:
- a first magnetic layer formed as a pattern portion that is a data portion in a servo region;
- a second magnetic layer formed as a non-pattern portion that is magnetized to be antiparallel with a magnetization direction of the first magnetic layer and of which coercive force is lower than a coercive force of the first magnetic layer;
- and
- a nonmagnetic layer formed between the first magnetic layer and the second magnetic layer,
- wherein the nonmagnetic layer is formed of Ru,
- the method comprising:
- a pattern formation process of forming the second magnetic layer as a non-pattern portion that is magnetized so as to be antiparallel with a magnetization direction of the first magnetic layer formed as a pattern portion in a servo region and of which coercive force is lower than a coercive force of the first magnetic layer;
- and
- a nonmagnetic layer formation process of forming the nonmagnetic layer made of a nonmagnetic material between the first magnetic layer and the second magnetic layer formed at the pattern formation process.
Dependencies are inferred from the claim text.