Magnetic recording head and disk drive provided therewith

A magnetic recording head comprising:

• a magnetic pole configured to apply a recording magnetic field;
• a write shield opposed to the magnetic pole with a write gap between the magnetic pole and the write shield;
• and
• a high-frequency oscillator between the magnetic pole and the write shield in a range of a width of the magnetic pole, and the high-frequency oscillator configured to generate a high-frequency magnetic field,
• wherein the high-frequency oscillator comprises a spin injection layer, an intermediate layer, and an oscillation layer, which are laminated in a laminating direction, and at least the oscillation layer comprises a surface perpendicular to the laminating direction, a slit or a notch formed in the surface of the oscillation layer, and oscillation regions divided by the slit or the notch,
• the high-frequency oscillator is arranged at a position including a center line of the magnetic pole.

A disk drive comprising:

• a disk-shaped recording medium comprising a recording layer;
• a driver configured to rotate the disk-shaped recording medium;
• and
• a magnetic recording head configured to perform information processing with respect to the disk-shaped recording medium, the magnetic recording head comprising:
• a magnetic pole configured to apply a recording magnetic field to the recording layer of the disk-shaped recording medium;
• a write shield opposed to the magnetic pole with a write gap between the magnetic pole and the write shield;
• and
• a high-frequency oscillator between the magnetic pole and the write shield in a range of a width of the magnetic pole in a track width direction, the high-frequency oscillator configured to generate a high-frequency magnetic field,
• wherein the high-frequency oscillator comprises a spin injection layer, an intermediate layer, and an oscillation layer, which are laminated in a laminating direction, and at least the oscillation layer comprises a surface perpendicular to the laminating direction, a slit or a notch formed in the surface of the oscillation layer to pierce the oscillation layer and the intermediate layer and reach the spin injection layer, and oscillation regions divided by the slit or notch,
• the oscillation regions of the oscillation layer are aligned in a direction perpendicular to a surface of the recording medium with a gap between the oscillation regions.