Miniature magnetic field sensor
First Claim
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1. A miniature magnetic field sensor comprising a magnetic core cooperating with at least one excitation coil and a detection coil, wherein the core is open and includes at least one bar having tapered ends.
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Abstract
A miniature magnetic field sensor including a magnetic core which co-operates with at least one excitation coil and a detection coil. In the magnetic field sensor, the core is open and includes at least one bar having tapered ends. A method of fabricating the sensor is provided using microtechnology techniques.
3 Citations
16 Claims
- 1. A miniature magnetic field sensor comprising a magnetic core cooperating with at least one excitation coil and a detection coil, wherein the core is open and includes at least one bar having tapered ends.
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16. A method for producing a miniature magnetic field sensor comprising a magnetic core cooperating with at least one excitation coil and a detection coil, the method comprising the steps of:
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providing a substrate; forming lower tracks of a conductive material between upper and lower layers of insulative material on the substrate; forming a core including a layer of a magnetic material of defined geometry on the upper layer of insulating material, the defined geometry of the layer of magnetic material being such that the core is open and includes at least one bar having tapered ends; covering the layer of magnetic material with a third insulative layer so that the layer of magnetic material is surrounded by insulative material; forming connections to the lower tracks by excavating trenches down to the lower tracks and depositing a conductive material in the trenches; forming a conductive material so as to form turns conjointly with the lower tracks and the connections; and depositing a layer of insulative material overlying the conductive material.
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Specification