Symmetrical STO for oscillation with both polarity bias

摘要

Embodiments disclosed herein generally relate to a MAMR head. The MAMR head includes an STO and a current switching system electrically coupled to the STO. The current switching system can be used to optimize the STO frequency by changing the STO bias polarity, i.e., by changing the direction of the current flowing to the STO. As a result, the difference between the STO frequency and the magnetic media frequency is minimized, which improves recording capability of the MAMR head.

主权项

1. A hard disk drive, comprising:
a magnetic media; a magnetic write head, wherein the magnetic write head comprises:
a main pole;a trailing shield; anda spin torque oscillator disposed between the main pole and the trailing shield; and a circuit electrically coupled to the magnetic write head, wherein the circuit comprises a current switching system electrically coupled to the spin torque oscillator, wherein the circuit further comprises a positive spin torque oscillator circuit electrically coupled to the current switching system and a negative spin torque oscillator circuit electrically coupled to the current switching system.