Patent ID: 8553507

Claim:
A magnetic data storage system, comprising: a magnetic disk medium; a microwave-assisted magnetic recording (MAMR) head, comprising: a main pole adapted for recording data to the magnetic disk medium, the main pole having a first recording width; a spin torque oscillator (STO) positioned near the main pole, the STO being adapted to apply a high-frequency magnetic field to the magnetic disk medium during a recording operation, wherein the STO is inoperable when in an off state and operable when in an on state; wherein the main pole has a second recording width when the STO is in the on state, the second recording width being different from the first recording width; a drive mechanism for passing the magnetic disk medium over the MAMR head; a read head comprising a magnetoresistance sensor; and a controller electrically coupled to the MAMR head for controlling operation of the MAMR head, wherein the controller is adapted for adjusting a shift quantity of the magnetic head depending on whether the STO is in the on state or the off state.