THIN MAGNETIC FILM, METHOD OF MANUFACTURING THE SAME, AND HIGH FREQUENCY OSCILLATOR, MAGNETIC HEAD, MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING/REPRODUCING APPARATUS USING THIN MAGNETIC FILM
First Claim
Patent Images
1. A thin magnetic film comprising:
- a nonmagnetic substrate;
a ruthenium underlayer formed on the nonmagnetic substrate; and
a magnetic layer formed in contact with the ruthenium underlayer, having a negative anisotropy of −
6×
106 to −
1.2×
107 erg/cm3 (−
6×
108 to −
1.2×
109 nJ/cm3) in a normal line direction perpendicular to a surface of the magnetic layer, and mainly containing Co1-xIrx (x=10 to 45 at %).
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Abstract
According to one embodiment, there is provided a thin magnetic film having a negative anisotropy of −6×106 erg/cm3 or less and including, on at least a nonmagnetic substrate, at least one seed layer made of a metal or metal compound, a ruthenium underlayer for controlling the orientation of an immediately overlying layer, and a magnetic layer having negative anisotropy in the normal line direction perpendicular to a surface of the magnetic layer and mainly containing Co and Ir, wherein the additive element concentration of Ir in the magnetic layer is 10 (inclusive) to 45 (inclusive) at %.
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Citations
14 Claims
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1. A thin magnetic film comprising:
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a nonmagnetic substrate; a ruthenium underlayer formed on the nonmagnetic substrate; and a magnetic layer formed in contact with the ruthenium underlayer, having a negative anisotropy of −
6×
106 to −
1.2×
107 erg/cm3 (−
6×
108 to −
1.2×
109 nJ/cm3) in a normal line direction perpendicular to a surface of the magnetic layer, and mainly containing Co1-xIrx (x=10 to 45 at %). - View Dependent Claims (2, 3)
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4. A thin magnetic film manufacturing method comprising:
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forming a ruthenium underlayer on a nonmagnetic substrate; annealing the ruthenium underlayer at a temperature of 400°
C. (inclusive) to 650°
C. (exclusive); andforming a magnetic layer mainly containing Co1-xIrx (x=10 to 45 at %), in contact with the annealed ruthenium underlayer. - View Dependent Claims (5)
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6. A high frequency oscillator comprising:
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a first electrode; a ruthenium underlayer formed on the first electrode; a first magnetic layer formed in contact with the ruthenium underlayer, having a negative anisotropy of −
6×
106 to −
1.2×
107 erg/cm3 (−
6×
108 to −
1.2×
109 nJ/cm3) in a normal line direction perpendicular to a surface of the first magnetic layer, and mainly containing Co1-xIrx (x=10 to 45 at %);a nonmagnetic interlayer formed on the first magnetic layer; a second magnetic layer formed on the nonmagnetic interlayer, having perpendicular magnetic anisotropy, and containing at least one magnetic material selected from the group consisting of iron, cobalt, and nickel; and a second electrode formed on the second magnetic layer. - View Dependent Claims (7, 8)
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9. A magnetic head comprising:
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a main magnetic pole; a recording magnetic pole forming a magnetic circuit together with the main magnetic pole; and a high frequency oscillator formed between the main magnetic pole and the recording magnetic pole and comprising a first electrode, a ruthenium underlayer formed on the first electrode, a first magnetic layer formed in contact with the ruthenium underlayer, having a negative anisotropy of −
6×
106 to −
1.2×
107 erg/cm3 (−
6×
108 to −
1.2×
109 nJ/cm3) in a normal line direction perpendicular to a surface of the first magnetic layer, and mainly containing Co1-xIrx (x=10 to 45 at %),a nonmagnetic interlayer formed on the first magnetic layer, a second magnetic layer formed on the nonmagnetic interlayer, having perpendicular magnetic anisotropy, and containing at least one magnetic material selected from the group consisting of iron, cobalt, and nickel, and a second electrode formed on the second magnetic layer.
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10. A magnetic recording/reproducing apparatus including a magnetic head comprising:
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a main magnetic pole; a recording magnetic pole forming a magnetic circuit together with the main magnetic pole; and a high frequency oscillator formed between the main magnetic pole and the recording magnetic pole and comprising a first electrode, a ruthenium underlayer formed on the first electrode, a first magnetic layer formed in contact with the ruthenium underlayer, having a negative anisotropy of −
6×
106 to −
1.2×
107 erg/cm3 (−
6×
108 to −
1.2×
109 nJ/cm3) in a normal line direction perpendicular to a surface of the first magnetic layer, and mainly containing Co1-xIrx (x=10 to 45 at %),a nonmagnetic interlayer formed on the first magnetic layer, a second magnetic layer formed on the nonmagnetic interlayer, having perpendicular magnetic anisotropy, and containing at least one type of a magnetic material selected from the group consisting of iron, cobalt, and nickel, and a second electrode formed on the second magnetic layer.
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11. A perpendicular magnetic recording medium comprising:
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a nonmagnetic substrate; a ruthenium underlayer formed on the nonmagnetic substrate; a soft magnetic backing layer formed in contact with the ruthenium underlayer, having a negative anisotropy of −
6×
106 to −
1.2×
107 erg/cm3 (−
6×
108 to −
1.2×
109 nJ/cm3) in a normal line direction perpendicular to a surface of the soft magnetic backing layer and mainly containing Co1-xIrx (x=10 to 45 at %); anda perpendicular magnetic recording layer formed on the soft magnetic backing layer and containing cobalt, chromium, and platinum. - View Dependent Claims (12, 13)
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14. A magnetic recording/reproducing apparatus comprising:
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a perpendicular magnetic recording medium comprising a nonmagnetic substrate, a ruthenium underlayer formed on the nonmagnetic substrate, a soft magnetic backing layer formed in contact with the ruthenium underlayer, having a negative anisotropy of −
6×
106 to −
1.2×
107 erg/cm3 (−
6×
108 to −
1.2×
109 nJ/cm3) in a normal line direction perpendicular to a surface of the soft magnetic backing layer, and mainly containing Co1-xIrx (x=10 to 45 at %), anda perpendicular magnetic recording layer formed on the soft magnetic backing layer and containing cobalt, chromium, and platinum; and a magnetic head.
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Specification