Passive solid-state magnetic field sensors and applications therefor
First Claim
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1. A magnetic field sensor comprising a magnetostrictive material in contact with a piezoelectric material, and configured such that, when the magnetostrictive material is subjected to an alternating magnetic field, a change in at least one dimension of the magnetostrictive material induces a strain in, and produces a detectable voltage signal in, the piezoelectric material, and wherein during operation the magnetic field sensor does not consume any external electrical power;
- and wherein the magnetic field sensor comprises a multilayer structure having a single layer of a first one of the magnetostrictive and piezoelectric material, and two layers of the second one of the magnetostrictive and piezoelectric materials positioned so that the single layer of the first material lies between the two layers of the second material.
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Abstract
Passive solid-state magnetic sensors are based on the combination of magnetorestrictive materials and piezoelectric materials. Sensors have applications in rotor speed detection, magnetic field detection, read heads, and MRAM, for example.
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Citations
19 Claims
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1. A magnetic field sensor comprising a magnetostrictive material in contact with a piezoelectric material, and configured such that, when the magnetostrictive material is subjected to an alternating magnetic field, a change in at least one dimension of the magnetostrictive material induces a strain in, and produces a detectable voltage signal in, the piezoelectric material, and wherein during operation the magnetic field sensor does not consume any external electrical power;
- and wherein the magnetic field sensor comprises a multilayer structure having a single layer of a first one of the magnetostrictive and piezoelectric material, and two layers of the second one of the magnetostrictive and piezoelectric materials positioned so that the single layer of the first material lies between the two layers of the second material.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- 13. A magnetic field sensor comprising a magnetostrictive material in contact with a piezoelectric material, and configured such that, when the magnetostrictive material is subjected to an alternating magnetic field, a change in at least one dimension of the magnetostrictive material induces a strain in, and produces a detectable voltage signal in, the piezoelectric material and wherein during operation the magnetic field sensor does not consume any external electrical power, the sensor comprising a magnetostrictive material substrate and a plurality of piezoelectric stripes on a surface of the substrate.
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