Composite magnetoelectric transduction unit based on magnetostrictive force coupling

Abstract

The invention relates to a composite magnetoelectric transduction unit based on magnetostrictive force coupling. The unit includes magnetostrictive layers and a piezoelectric layer, the magnetostrictive layers and the piezoelectric layer are fixed to each other at a position close to both ends, the magnetostrictive layers and the piezoelectric layer are located between fixed points of the both ends and are not in contact with each other, and the magnetostrictive force generated by the magnetostrictive layers under action of a magnetic field is transmitted to the piezoelectric layer through thefixed points at the both ends, so that the piezoelectric layer is forced to generate electrical output; and when the magnetostrictive layers and the piezoelectric layer are combined, the magnetostrictive layers are not completely in contact with and fixed with the piezoelectric layer, but only two ends of the magnetostrictive layers are bonded to both ends of the piezoelectric layer through gaskets, or adhesive layers or bosses, the contact area between the magnetostrictive layers and the piezoelectric layer is greatly reduced, intrinsic noise of a magnetoelectric response is effectively reduced, and the composite magnetoelectric transduction unit has a higher Q value.

Description

technical field [0001] The invention relates to a magnetoelectric energy conversion unit or structure, in particular to a magnetoelectric sensitive material and structure based on a magnetostrictive force coupled magnetostrictive material / piezoelectric material composite. Background technique [0002] Combining different materials in a certain way and using their composite effects to improve the properties of different materials and discover new properties is a research hotspot in the field of functional materials and devices. In particular, the magnetostrictive / piezoelectric composite material can be formed by combining the magnetostrictive material and the piezoelectric material in a certain way, and the magnetoelectric effect can be obtained according to the product performance of the composite material. Meanwhile, in order to realize the effective coupling of strain, close contact is required between the magnetostrictive phase and the piezoelectric phase. So far, partic...

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Problems solved by technology

This factor will make it difficult to further reduce the noise of the magnetostrictive / piezoelectric composite sensor with the structure of the magnetostrictive / piezoelectric laminated composite material.

On the other hand, in this composite method, due to the strain coupling between the magnetostrictive layer and the piezoelectric layer, the quality factor (Q value) of the magnetostrictive / piezoelectric laminated structure depends on the quality of the magnetostrictive material The combination of the Q factor and the quality factor of the piezoelectric material, while the quality factor of the magnetostrictive material is usually small (<100), thus limiting the overall effective quality factor of the magnetostrictive / piezoelectric laminated structure

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