Magnetic head and magnetic recording/reproducing device
First Claim
Patent Images
1. A magnetic head comprising:
- a main magnetic pole which applies a record magnetic field to a magnetic recording medium;
an auxiliary magnetic pole configured to form a magnetic circuit together with the main magnetic pole; and
a spin torque oscillator formed between the main magnetic pole and the auxiliary magnetic pole;
wherein the spin torque oscillator includes a spin injection layer formed on one of the main magnetic pole and the auxiliary magnetic pole, a nonmagnetic intermediate layer formed on the spin injection layer, and an oscillation layer formed on the nonmagnetic intermediate layer,the spin injection layer has an artificial lattice film obtained by stacking a first metal layer of a Heusler alloy and a second metal layer which is formed on the first metal layer and includes at least one of platinum, palladium, and nickel two times or more repeatedly, andthe first metal layer has a thickness of 0.3 to 3.5 nm.
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Abstract
According to one embodiment, a magnetic head according to the embodiment includes a main magnetic pole, a spin torque oscillator, and an auxiliary magnetic pole. The spin torque oscillator includes a spin injection layer, a nonmagnetic intermediate layer, and an oscillation layer. The spin injection layer has an artificial lattice film obtained by stacking a first metal layer of a Heusler alloy and a second metal layer including at least one of platinum, palladium, and nickel two times or more repeatedly, and the first metal layer has a thickness of 0.3 to 3.5 nm.
39 Citations
6 Claims
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1. A magnetic head comprising:
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a main magnetic pole which applies a record magnetic field to a magnetic recording medium; an auxiliary magnetic pole configured to form a magnetic circuit together with the main magnetic pole; and a spin torque oscillator formed between the main magnetic pole and the auxiliary magnetic pole; wherein the spin torque oscillator includes a spin injection layer formed on one of the main magnetic pole and the auxiliary magnetic pole, a nonmagnetic intermediate layer formed on the spin injection layer, and an oscillation layer formed on the nonmagnetic intermediate layer, the spin injection layer has an artificial lattice film obtained by stacking a first metal layer of a Heusler alloy and a second metal layer which is formed on the first metal layer and includes at least one of platinum, palladium, and nickel two times or more repeatedly, and the first metal layer has a thickness of 0.3 to 3.5 nm. - View Dependent Claims (2, 3)
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4. A magnetic recording/reproducing device comprising:
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a magnetic head including a main magnetic pole which applies a record magnetic field to a magnetic recording medium; an auxiliary magnetic pole configured to form a magnetic circuit together with the main magnetic pole; and a spin torque oscillator formed between the main magnetic pole and the auxiliary magnetic pole; wherein the spin torque oscillator includes a spin injection layer formed on one of the main magnetic pole and the auxiliary magnetic pole, a nonmagnetic intermediate layer formed on the spin injection layer, and an oscillation layer formed on the nonmagnetic intermediate layer, the spin injection layer has an artificial lattice film obtained by stacking a first metal layer of a Heusler alloy and a second metal layer which is formed on the first metal layer and includes at least one of platinum, palladium, and nickel two times or more repeatedly, and the first metal layer has a thickness of 0.3 to 3.5 nm. - View Dependent Claims (5, 6)
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Specification