Pile spin-torque oscillator with AF-mode oscillation for generating high AC-field in microwave-assisted magnetic recording
First Claim
1. A microwave-assisted magnetic recording head having a main pole and a trailing shield, comprising:
- a first spin-torque oscillator comprising a first magnetic layer, a first non-magnetic interlayer disposed on the first magnetic layer, and a second magnetic layer disposed on the first non-magnetic interlayer;
a second spin-torque oscillator comprising a third magnetic layer, a second non-magnetic interlayer disposed on the third magnetic layer, and a fourth magnetic layer disposed on the second non-magnetic interlayer; and
a spin torque shield layer interposed between the first spin-torque oscillator and the second spin-torque oscillator, wherein an applied current is adapted to flow in a direction from the second magnetic layer to the first magnetic layer, and from the fourth magnetic layer to the third magnetic layer, wherein the spin torque shield layer comprises Ru or Rh.
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Abstract
The present disclosure generally relates to a structure for a perpendicular microwave-assisted magnetic recording head used in a magnetic disk drive. A first spin-torque oscillator and a second spin-torque oscillator are positioned between the main pole of a recording head and a trailing shield, and are separated by a spin torque shield layer. The first spin-torque oscillator comprises a first magnetic layer, a first non-magnetic interlayer, and a second magnetic layer. The second spin-torque oscillator comprises a third magnetic layer, a second non-magnetic interlayer, and a fourth magnetic layer. An applied current is adapted to flow in a direction from the second magnetic layer to the first magnetic layer, and from the fourth magnetic layer to the third magnetic layer.
60 Citations
13 Claims
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1. A microwave-assisted magnetic recording head having a main pole and a trailing shield, comprising:
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a first spin-torque oscillator comprising a first magnetic layer, a first non-magnetic interlayer disposed on the first magnetic layer, and a second magnetic layer disposed on the first non-magnetic interlayer; a second spin-torque oscillator comprising a third magnetic layer, a second non-magnetic interlayer disposed on the third magnetic layer, and a fourth magnetic layer disposed on the second non-magnetic interlayer; and a spin torque shield layer interposed between the first spin-torque oscillator and the second spin-torque oscillator, wherein an applied current is adapted to flow in a direction from the second magnetic layer to the first magnetic layer, and from the fourth magnetic layer to the third magnetic layer, wherein the spin torque shield layer comprises Ru or Rh. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A microwave-assisted magnetic recording head having a main pole and a trailing shield, comprising:
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a first spin-torque oscillator comprising a first spin polarization layer on the main pole, a first non-magnetic spacer layer disposed on the first spin polarization layer, and a first field generation layer disposed on the first non-magnetic spacer layer; a second spin-torque oscillator comprising a second spin polarization layer, a second non-magnetic spacer layer disposed on the second spin polarization layer, and a second field generation layer disposed between the second non-magnetic spacer layer and the trailing shield; and a spin torque shield layer interposed between the first field generation layer of the first spin-torque oscillator and the second field generation layer of the second spin-torque oscillator;
wherein an applied current is adapted to flow in a direction from the second field generation layer to the first spin polarization layer, and wherein when the current is applied;a spin torque of the first field generation layer is anti-parallel in direction to the spin torque of the first spin polarization layer, and the spin torque of the second field generation layer is anti-parallel in direction to the spin torque of the second spin polarization layer; and the first field generation layer and the second spin polarization layer are anti-ferromagnetically coupled. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification