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US 8,803,519 B2Granted
Enhanced magnetic sensor biasing yoke
AssigneeSeagate Technology LLC
InventorsDimitar V. Dimitrov, Dian Song, Jason B. Gadbois
Life of this patent
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Abstract
An apparatus and associated method are generally directed to a magnetic sensor. A sensor may have a stack with an air bearing surface (ABS) and a biasing surface opposite the ABS. A biasing yoke can be disposed between a biasing magnet and the stack with the biasing magnet having a lower magnet moment than the biasing yoke.
Claims20
A magnetoresistive sensor, comprising:
- a stack with an air bearing surface (ABS);
- and
- a biasing yoke disposed between and aligned with a biasing magnet and the stack along an axis perpendicular to the ABS, the biasing yoke positioned to be saturated by the biasing magnet and bias the stack with a default magnetization, the biasing magnet having a lower magnet moment than the biasing yoke.
A sensor, comprising:
- a stack with an air bearing surface (ABS);
- and
- a first biasing element disposed between and aligned with the stack and a second biasing element along an axis perpendicular to the ABS, the first biasing element positioned to be saturated be the second biasing element and bias the stack with a default magnetization, the first biasing element having a stack feature that maintains the first biasing element in a magnetically saturated state.
A method comprising:
- constructing a stack with an air bearing surface (ABS);
- and
- positioning a biasing yoke between a biasing magnet and the stack along an axis perpendicular to the ABS, the biasing yoke positioned to be saturated by the biasing magnet and bias the stack with a default magnetization, the biasing magnet having a lower magnet moment than the biasing yoke.
Dependencies are inferred from the claim text.