Magnetic recording head and disk device comprising the magnetic recording head

A magnetic recording head comprising:

• an air-bearing surface;
• a main magnetic pole which comprises a distal end portion extending to the air-bearing surface and is configured to produce a recording magnetic field;
• a write shield which is opposed to the distal end portion of the main magnetic pole across a write gap;
• a high-frequency oscillator which comprises a stacked spin injection layer and a stacked oscillation layer and is provided between the main magnetic pole and the write shield in the write gap, each of the oscillation layer and the spin injection layer comprising a stack surface extending in a direction intersecting with the air-bearing surface;
• and
• a magnetic material layer which is provided in at least one of the main magnetic pole and the write shield, faces the high-frequency oscillator, and has negative magnetic anisotropy with respect to a direction intersecting with the stack surfaces of the high-frequency oscillator.