Magnetic field sensor constructed from a remagnetization line and one magnetoresistive resistor or a plurality of magnetoresistive resistors
First Claim
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1. A magnetic field sensor, comprising:
- a magnetoresistive resistor including at least one magnetoresistive film strip having a longitudinal direction and including a plurality of magnetically separated regions each having a longitudinal direction coinciding with the longitudinal direction of the film strip and being connected one behind the other in the longitudinal direction of the film strip, each said region having a Barber pole structure, the Barber pole structures of the respective regions forming alternatingly positive and negative angles with respect to the longitudinal direction of the film strip; and
a remagnetization line including a highly-conductive thin-film conductor strip having a longitudinal direction forming an angle with the longitudinal direction of the magnetoresistive film strip, being insulated from the film strip, and being disposed in meander form beneath the film strip.
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Abstract
Described is a sensor based on the magnetoresistive effect and integrated into the thin-film arrangement of a remagnetization line in the form of a meander. In an adaptation to this meandering structure, the magnetoresistive film strips are provided in regions with alternating positive- and negative-inclined Barber pole structures. When periodic remagnetization of the regions takes place, a drift-free AC voltage is obtained as a sensor output signal. This lack of drift is the presupposition for the use of the magnetic field sensor for precise measurement of weak magnetic fields.
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Citations
6 Claims
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1. A magnetic field sensor, comprising:
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a magnetoresistive resistor including at least one magnetoresistive film strip having a longitudinal direction and including a plurality of magnetically separated regions each having a longitudinal direction coinciding with the longitudinal direction of the film strip and being connected one behind the other in the longitudinal direction of the film strip, each said region having a Barber pole structure, the Barber pole structures of the respective regions forming alternatingly positive and negative angles with respect to the longitudinal direction of the film strip; and a remagnetization line including a highly-conductive thin-film conductor strip having a longitudinal direction forming an angle with the longitudinal direction of the magnetoresistive film strip, being insulated from the film strip, and being disposed in meander form beneath the film strip. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification