Two magnetoelectric composite materials and preparation method thereof

Abstract

The invention discloses two magnetoelectric composite materials and a preparation method thereof. The magnetoelectric composite material consists of a composite piezoelectric piece and a magnetostrictive alloy Ni or magnetostrictive material Terfenol-D, wherein the composite piezoelectric piece is fixedly adhered to the magnetostrictive alloy Ni or magnetostrictive material Terfenol-D through GE glue, and the composite piezoelectric piece is made by connecting a plurality of layers of composite piezoelectric pieces in parallel; and the composite piezoelectric piece has great capacitance, and the magnetoelectric composite material has high magnetoelectric conversion sensitivity. The preparation method comprises the following steps of: firstly, adhering the composite piezoelectric piece and the magnetostrictive alloy Ni or magnetostrictive material Terfenol-D through GE glue; secondly, baking and holding for 50 min at a temperature of 150 DEG C; and finally, naturally cooling to room temperature to obtain the required magnetoelectric composite material. The magnetoelectric composite materials have very high magnetoelectric sensitivity and inverse magnetoelectric effects at normal temperature, and the sample preparation is simple, so that the materials can be mass-produced; the compounding of the composite piezoelectric piece and the magnetostrictive alloy Ni requires a low bias ratio, so that the materials are favorable for application in practical devices; and the structure is simple, and the practicality is strong, so that the materials have stronger popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of magnetoelectric materials, and in particular relates to two magnetoelectric composite materials and a preparation method thereof. Background technique [0002] The magnetoelectric effect refers to the phenomenon that the material undergoes an electric polarization response in an external magnetic field, or the phenomenon that the material undergoes a magnetization change in an external electric field. The latter is usually called the inverse magnetoelectric effect. Since the French physicist Curie P predicted the magnetoelectric effect at the end of the 19th century, many single-phase magnetoelectric materials have been discovered, such as Cr 2 o 3 , YMnO 3 Wait. The ferromagnetic Curie temperature point (antiferromagnetic Neel temperature point) of single-phase magnetoelectric materials is generally far below room temperature, and their magnetoelectric coupling is very weak, so they have not yet been ...

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Problems solved by technology

[0004] The present invention provides two kinds of magnetoelectric composite materials and their preparation methods, aiming to solve the problem that the magnetoelectric composite materials provided by the prior art cannot obtain high magnetoelectric properties at room temperature, the sample preparation is complicated, and it is not suitable for large-scale production , which is not conducive to the application of practical devices in the problem of

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