Magnetic head and magnetic recording/reproducing apparatus

A magnetic head comprising:

• a main pole that generates a recording magnetic field;
• a trailing shield disposed opposite the main pole;
• and
• an oscillator disposed between the main pole and the trailing shield that generates a high-frequency magnetic field,
• wherein:
• the oscillator includes a non-magnetic metal layer, a spin injection pinned layer, an intermediate layer, and a high-frequency magnetic field generation layer;
• and
• the non-magnetic metal layer is disposed adjacent to the main pole or the trailing shield and tapered with a width in an element height direction gradually increased with increasing distance from the intermediate layer.

A magnetic recording/reproducing apparatus comprising:

• a magnetic recording medium;
• a medium drive unit that drives the magnetic recording medium;
• a magnetic head that performs writing or reading of a signal with respect to the magnetic recording medium;
• and
• a head drive unit that positions the magnetic head over a desired track of the magnetic recording medium,
• wherein:
• the magnetic head includes a main pole that generates a recording magnetic field, a trailing shield disposed opposite the main pole, and an oscillator disposed between the main pole and the trailing shield that generates a high-frequency magnetic field;
• the oscillator includes a non-magnetic metal layer, a spin injection pinned layer, an intermediate layer, and a high-frequency magnetic field generation layer;
• and
• the non-magnetic metal layer is disposed adjacent to the main pole or the trailing shield and tapered with a width in a track width direction and/or in an element height direction gradually increased with increasing distance from the intermediate layer.