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US 2008/0259504 A1Published application
Shield biasing for mr devices
OwnerRobert Glenn Biskeborninventor
Life of this patent
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Abstract
A magnetic data system according to one embodiment includes a head having a plurality of readers formed above a common substrate, each reader further comprising a shield and a sensor, a bias circuit associated with each reader for passing a bias current through the sensor thereof, wherein the bias circuits are floating. A charge clamp electrically couples each shield to the associated bias circuit. A shield biasing circuit is operatively coupled to each shield for setting a potential of the shield independently of the bias current.
Claims20
A magnetic data system, comprising:
- a head having a plurality of readers formed above a common substrate, each reader further comprising a shield and a sensor;
- a bias circuit associated with each reader for passing a bias current through the sensor thereof, wherein the bias circuits are floating;
- and
- a shield biasing circuit operatively coupled to each shield for setting a potential of the shield independently of the bias current.
1 more element
A magnetic data system, comprising:
- a head having a plurality of readers formed above a common substrate, each reader further comprising a shield and a sensor;
- a bias circuit associated with each reader for passing a bias current through the sensor thereof, wherein the bias circuits are floating;
- a substrate biasing circuit for setting a potential of the substrate;
- and
- a shield biasing circuit operatively coupled to each shield for setting a potential of each shield to about match the potential of the substrate,
- wherein the shields are not coupled directly to a around.
3 more elements
A magnetic data system, comprising:
- a head having a plurality of readers formed above a common substrate, each reader further comprising a shield and a sensor;
- a bias circuit associated with each reader for passing a bias current through the sensor thereof, wherein the bias circuits are floating;
- a circuit electrically coupling each shield to the associated bias circuit;
- and
- a shield biasing circuit operatively coupled to each shield for setting a potential of the shield independently of the bias current,
- wherein the potential of each shield is set to match about a potential of the substrate, wherein at least one of the shields is not electrically coupled to the substrate.
3 more elements
Dependencies are inferred from the claim text.