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US 12,688,869 B2Granted
Topological insulator based spin torque oscillator reader
AssigneeWestern Digital Technologies, Inc.
InventorsXiaoyong Liu, Zhanjie Li, Quang Le, Brian R. York, Cherngye Hwang, Kuok San Ho, Hisashi Takano
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Abstract
The present disclosure generally relates to a bismuth antimony (BiSb) based STO (spin torque oscillator) sensor. The STO sensor comprises a SOT device and a magnetic tunnel junction (MTJ) structure. By utilizing a BiSb layer within the SOT device, a larger spin Hall angle (SHA) can be achieved, thereby improving the efficiency and reliability of the STO sensor.
Claims20
A magnetic recording device, comprising:
- a magnetic recording head, comprising:
- a sensor, comprising:
- an antiferromagnetic (AFM) layer disposed at a media facing surface (MFS);
- a magnetic tunnel junction (MTJ) structure comprising a free layer;
- and
- a spin orbit torque (SOT) device comprising a bismuth antimony (BiSb) layer;
- means for flowing a current through the SOT device while reading data from a magnetic recording media;
- and
- means for measuring frequency of a precession of the free layer, wherein the precession is responsive to a magnetic field generated by the magnetic recording media.
6 more elements
A magnetic recording device, comprising:
- a magnetic recording head, comprising:
- a sensor, comprising:
- an antiferromagnetic (AFM) layer disposed at a media facing surface (MFS);
- a magnetic tunnel junction (MTJ) structure comprising:
- a free layer;
- a first pinning layer;
- a Ru layer;
- and
- a second pinning layer;
- and
- a spin orbit torque (SOT) device comprising:
- a first buffer layer;
- a bismuth antimony (BiSb) layer disposed on the first buffer layer;
- and
- a second buffer layer disposed on the BiSb layer;
- means for flowing a current through the SOT device while reading data from a magnetic recording media;
- and
- means for measuring frequency of a precession of the free layer, wherein the precession is responsive to a magnetic field generated by the magnetic recording media.
15 more elements
A magnetic recording device, comprising:
- a magnetic recording head, comprising:
- a sensor, comprising:
- an antiferromagnetic (AFM) layer;
- a magnetic tunnel junction (MTJ) structure comprising a free layer;
- and
- a spin orbit torque (SOT) device comprising a bismuth antimony (BiSb) layer, the SOT device being disposed in contact with the MTJ structure;
- means for flowing a current through the SOT device while reading data from a magnetic recording media;
- and
- means for measuring frequency of a precession of the free layer, wherein the precession is responsive to a magnetic field generated by the magnetic recording media.
6 more elements
Dependencies are inferred from the claim text.