Microwave-assisted magnetic recording head and magnetic recording and reproducing device

A microwave-assisted magnetic recording head comprising:

• a main magnetic pole;
• an auxiliary magnetic pole facing the main magnetic pole with a gap therebetween;
• and
• a stacked-layer element disposed in the gap, and including, in the order from the auxiliary magnetic pole to the main magnetic pole,
• a thermal spin injection layer that is formed on the auxiliary magnetic pole, exchange-coupled with the auxiliary magnetic pole, and formed of a magnetic material of which spin-dependent Seebeck coefficient is negative,
• a first non-magnetic layer formed on the thermal spin injection layer,
• an oscillation layer formed on the first non-magnetic layer,
• a second non-magnetic layer formed on the oscillation layer, and
• a spin injection layer formed on the second non-magnetic layer.

A magnetic disk device comprising:

• a rotatable disk including a magnetic recording layer;
• and
• a magnetic recording head including
• a main magnetic pole,
• an auxiliary magnetic pole facing the main magnetic pole with a gap therebetween, and
• a stacked-layer element disposed in the gap, and including, in the order from the main magnetic pole to the auxiliary magnetic pole,
• a thermal spin injection layer that is formed on the main magnetic pole, exchange-coupled with the main magnetic pole, and formed of a magnetic material of which spin-dependent Seebeck coefficient is negative,
• a first non-magnetic layer formed on the thermal spin injection layer,
• an oscillation layer formed on the first non-magnetic layer,
• a second non-magnetic layer formed on the oscillation layer, and
• a spin injection layer formed on the second non-magnetic layer.