Magnetic recording medium
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsRyuji Sugita, Kiyokazu Tohma, Tatsuaki Ishida, Kazunari Yoshimoto
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Abstract
A magnetic recording medium having a first magnetic layer positioned on a substrate and a second magnetic layer positioned on the first magnetic layer, wherein the first magnetic layer is a film of a partial oxide based on Co in which a growth direction of crystalline grain is substantially normal to the film plane and the easy magnetization axis is in a direction of the film plane or direction substantially normal to the film plane, and the second magnetic layer is a film of a partial oxide based on Co in which the growth direction of crystalline grain is diagonally inclined to the line normal to the film plane and the easy magnetization axis is diagonally inclined to the line normal to the film plane.
Claims16
A magnetic recording medium comprising a first magnetic layer positioned on a substrate and a second magnetic layer positioned on the first magnetic layer,
- wherein the first magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which a growth direction of crystalline grain is substantially normal to the film plane and the easy magnetization axis is in a direction of the film plane, and
- the second magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane and the easy magnetization axis is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane.
A magnetic recording medium comprising a first magnetic layer positioned on a substrate and a second magnetic layer positioned on the first magnetic layer,
- wherein the first magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which a growth direction of crystalline grain is substantially normal to the film plane and the easy magnetization axis is in a direction substantially normal to the film plane, and
- the second magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane and the easy magnetization axis is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane.
A magnetic recording medium comprising a first magnetic layer positioned on a substrate, a second magnetic layer positioned on the first magnetic layer and a third magnetic layer positioned on the second magnetic layer,
- wherein the first magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which a growth direction of crystalline grain is substantially normal to the film plane and the easy magnetization axis is in a direction of film plane,
- the second magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane and the easy magnetization axis is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane, and
- the third magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane and the easy magnetization axis is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane.
A magnetic recording medium comprising a first magnetic layer positioned on a substrate, a second magnetic layer positioned on the first magnetic layer and a third magnetic layer positioned on the second magnetic layer,
- wherein the first magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which a growth direction of crystalline grain is substantially normal to the film plane and the easy magnetization axis is in a direction substantially normal to the film plane,
- the second magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane and the easy magnetization axis is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane, and
- the third magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane and the easy magnetization axis is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane.
A magnetic recording medium comprising a first magnetic layer positioned on a substrate, a second magnetic layer positioned on the first magnetic layer, a fourth magnetic layer positioned on the second magnetic layer and a third magnetic layer positioned on the fourth magnetic layer,
- wherein the first magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which a growth direction of crystalline grain is substantially normal to the film plane and the easy magnetization axis is in a direction of the film plane,
- the second magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane and the easy magnetization axis is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane,
- the fourth magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is substantially normal to the film plane and the easy magnetization axis is in the direction of film plane, and
- the third magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane and the easy magnetization axis is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane.
A magnetic recording medium comprising a first magnetic layer positioned on a substrate, a second magnetic layer positioned on the first magnetic layer, a fourth magnetic layer positioned on the second magnetic layer and a third magnetic layer positioned on the fourth magnetic layer,
- wherein the first magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which a growth direction of crystalline grain is substantially normal to the film plane and the easy magnetization axis is in a direction substantially normal to the film plane,
- the second magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is inclined at an angle of 20.degree. to 85.degree. to a line normal to the film plane and the easy magnetization axis is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane,
- the fourth magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is substantially normal to the film plane and the easy magnetization axis is in the direction of film plane, and
- the third magnetic layer comprises a film of a partial oxide comprising Co having an oxygen content of 5 to 48% by atom in which the growth direction of crystalline grain is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane and the easy magnetization axis is inclined at an angle of 20.degree. to 85.degree. to the line normal to the film plane.
Dependencies are inferred from the claim text.