Reversed mode spin torque oscillator with shaped field generation layer

A magnetic recording head, comprising:

• a main pole;
• a spin torque oscillator in contact with the main pole, wherein the spin torque oscillator comprises a spin polarization layer and a field generation layer disposed between the spin polarization layer and the main pole, wherein the field generation layer includes a surface at a media facing surface, and the surface has a trapezoidal shape;
• a non-magnetic conductive structure surrounding at least a portion of the main pole, wherein the non-magnetic conductive structure is in contact with the spin torque oscillator
• an underlayer in contact with the main pole and the non-magnetic conductive structure, wherein the field generation layer is disposed on the underlayer;
• an interlayer disposed between the spin polarization layer and the field generation layer;
• and
• a cap layer disposed on the spin polarization layer.

A magnetic recording head, comprising:

• a main pole;
• a spin torque oscillator in contact with the main pole, wherein the spin torque oscillator comprises a spin polarization layer and a field generation layer disposed between the spin polarization layer and the main pole, wherein the field generation layer includes a surface at a media facing surface, and the surface includes a first side facing the main pole and a second side facing the spin polarization layer, wherein the first side has a length that is substantially greater than a length of the second side;
• and
• a non-magnetic conductive structure surrounding at least a portion of the main pole, wherein the first side of the field generation layer is disposed over at least a portion of the non-magnetic conductive structure.