Magnetic field detection sensor
OwnerManish Sharma, Frederick Pernerinventors
Life of this patent
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Abstract
The invention includes a magnetic field detection sensor. The magnetic field detection sensor includes a first magnetic sensor including a first sense layer and a first reference layer. A second magnetic sensor includes a second sense layer and a second reference layer. The first magnetic sensor is physically oriented relative to the second magnetic sensor so that external magnetic fields detected by the magnetic field detection sensor cause a relative magnetic orientation of the first sense layer to the first reference layer to be opposite of a relative magnetic orientation of the second sense layer to the second reference layer. A differential amplifier can senses the relative magnetic orientations of the first junction sensor and the second junction sensor.
Claims22
A magnetic field detection sensor comprising:
- a first magnetic sensor comprising a first sense layer and a first reference layer;
- a second magnetic sensor comprising a second sense layer and a second reference layer;
- the first magnetic sensor physically oriented relative to the second magnetic sensor so that external magnetic fields detected by the magnetic field detection sensor cause a relative magnetic orientation of the first sense layer to the first reference layer to be opposite of a relative magnetic orientation of the second sense layer to the second reference layer;
- and
- a differential amplifier for sensing the relative magnetic orientations of the first magnetic sensor and the second magnetic sensor.
A magnetic field detection sensor comprising:
- a first magnetic tunnel junction sensor comprising a first sense layer and a first reference layer;
- a second magnetic tunnel junction sensor comprising a second sense layer and a second reference layer;
- wherein
- the first magnetic tunnel junction sensor is physically oriented relative to the second magnetic tunnel junction sensor so that external magnetic fields detected by the magnetic field detection sensor cause a relative magnetic orientation of the first sense layer to the first reference layer to be opposite of a relative magnetic orientation of the second sense layer to the second reference layer.
A magnetic disk drive comprising:
- a magnetic disk comprising information stored on a surface of the disk;
- a magnetic field detection sensor for detecting the information stored on the surface of the disk;
- the magnetic field detection sensor comprising;
- a first magnetic sensor comprising a first sense layer and a first reference layer;
- a second magnetic sensor comprising a second sense layer and a second reference layer;
- wherein
- the first magnetic sensor is physically oriented relative to the second magnetic sensor so that external magnetic fields detected by the magnetic field detection sensor cause a relative magnetic orientation of the first sense layer to the first reference layer to be opposite of a relative magnetic orientation of the second sense layer to the second reference layer.
An array of magnetic field detection sensors comprising:
- a plurality of magnetic field detection sensors located according to a pattern, each magnetic field detection sensor comprising;
- each magnetic field detection sensor comprising;
- a first magnetic sensor comprising a first sense layer and a first reference layer;
- a second magnetic sensor comprising a second sense layer and a second reference layer;
- wherein
- the first magnetic sensor is physically oriented relative to the second magnetic sensor so that external magnetic fields detected by the magnetic field detection sensor cause a relative magnetic orientation of the first sense layer to the first reference layer to be opposite of a relative magnetic orientation of the second sense layer to the second reference layer.
A method of detecting a magnetic field with a magnetic field detection sensor, the magnetic field detection sensor comprising a first magnetic sensor comprising a first sense layer and a first reference layer, and a second magnetic sensor comprising a second sense layer and a second reference layer, wherein the first magnetic sensor is physically oriented relative to the second magnetic sensor so that external magnetic fields detected by the magnetic field detection sensor cause a relative magnetic orientation of the first sense layer to the first reference layer to be opposite of a relative magnetic orientation of the second sense layer to the second reference layer, the method comprising:
- subjecting the magnetic field detection sensor to a magnetic field;
- and
- sensing a difference between a first resistance of the first magnetic sensor and a second resistance of the second magnetic sensor.
Dependencies are inferred from the claim text.