Magnetic head and magnetic recording/reproduction apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsKatsuhiko KOUI, Shuichi Murakami, Mariko Shimizu, Kenichiro Yamada
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Abstract
According to one embodiment, an oscillation layer of a spin torque oscillator for use in a magnetic head includes a stack of first and second metal films. The first metal film is formed by repetitively stacking a combination of first and second magnetic layers twice or more. The thickness of the first metal film is 0.4 to 5.0 nm. The first magnetic layer has a bcc structure and contains Fe. The second magnetic layer contains Co. The second metal film is made of Cu.
Claims8
A magnetic head comprising:
- a main magnetic pole configured to apply a recording 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 an oscillation layer formed on one of the main magnetic pole and the auxiliary magnetic pole, an interlayer formed on the oscillation layer, and a spin injection layer formed on the interlayer,
- the oscillation layer has a bcc structure, and includes a first metal film formed by repetitively stacking, not less than twice, a combination of a first magnetic layer containing iron and a second magnetic layer formed on the first magnetic layer and containing cobalt, and a second metal film formed on the first metal film and made of copper, and
- a thickness of the first metal film is 0.4 to 5.0 nm.
A magnetic recording/reproduction apparatus comprising a magnetic head comprising:
- a main magnetic pole configured to apply a recording 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 an oscillation layer formed on one of the main magnetic pole and the auxiliary magnetic pole, an interlayer formed on the oscillation layer, and a spin injection layer formed on the interlayer,
- the oscillation layer has a bcc structure, and includes a first metal film formed by repetitively stacking, not less than twice, a combination of a first magnetic layer containing iron and a second magnetic layer formed on the first magnetic layer and containing cobalt, and a second metal film formed on the first metal film and made of copper, and
- a thickness of the first metal film is 0.4 to 5.0 nm.
Dependencies are inferred from the claim text.