Symmetrical STO for oscillation with both polarity bias
AssigneeHGST Netherlands B.V.
InventorsMasato Shiimoto, Masashige Sato, Masukazu Igarashi, Yo Sato, Masato Matsubara
Life of this patent
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Abstract
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.
Claims20
A hard disk drive, comprising:
- a magnetic media;
- a magnetic write head, wherein the magnetic write head comprises:
- a main pole;
- a trailing shield;
- and
- a 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.
A method, comprising:
- flowing a current to a spin torque oscillator, wherein the current is flowed to the spin torque oscillator in a first direction;
- and
- changing the flow of the current to the spin torque oscillator, wherein the current is flowed to the spin torque oscillator in a second direction, wherein the second direction is opposite the first direction, wherein the current in the first direction is provided by a positive spin torque oscillator circuit and the current in the second direction is provided by a negative spin torque oscillator circuit.
A method, comprising:
- flowing a current to a spin torque oscillator disposed between a main pole and a trailing shield, wherein the current is flowed from the main pole to the trialing shield;
- and
- changing the flow of the current to the spin torque oscillator, wherein the current is flowed to the spin torque oscillator from the trailing shield to the main pole, wherein the current from the main pole to the trailing shield is provided by a positive spin torque oscillator circuit and the current from the trailing shield to the main pole is provided by a negative spin torque oscillator circuit.
A magnetic head, comprising:
- a main pole;
- a trailing shield;
- a spin torque oscillator disposed between the main pole and the trailing shield, wherein the spin torque oscillator is electrically connected to a current switching system;
- a positive spin torque oscillator circuit electrically connected to the current switching system;
- and
- a negative spin torque oscillator circuit electrically connected to the current switching system.
Dependencies are inferred from the claim text.