Microwave assisted magnetic recording head having spin torque oscillator frequency detection
AssigneeHGST Netherlands B.V.
InventorsMasashige Sato, Susumu Okamura, Yo Sato, Keiichi Nagasaka
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Abstract
A magnetic write head having a spin torque oscillator with a magnetic field sensor for accurately determining magnetic field oscillation frequency. The spin torque oscillator has one or more tunnel junction (TMR) sensors formed at the side of the spin torque oscillator. The TMR sensor advantageously detects a magnetic field signal that is an additive signal of both fields from the spin polarization layer and the magnetic field generation layer, thereby providing efficient detection of magnetic field and associated oscillation frequency.
Claims20
A magnetic write head, comprising:
- a spin torque oscillator having a leading edge, a trailing edge and a side extending from the leading edge to the trailing edge;
- and
- a magnetic sensor formed at the side of the spin torque oscillator.
A magnetic data recording system, comprising:
- a housing;
- a magnetic media held within the housing;
- an actuator mounted within the housing;
- a slider connected with the actuator for movement adjacent to a surface of the magnetic media;
- and
- a magnetic recording head formed on the slider, the magnetic recording head including:
- a spin torque oscillator having a leading edge, a trailing edge and a side extending from the leading edge to the trailing edge;
- and
- a magnetic sensor formed at the side of the spin torque oscillator.
Dependencies are inferred from the claim text.