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Method for improving magneto-electric effect of composite materials

A composite material, magnetoelectric effect technology, applied in chemical instruments and methods, magnetostrictive device manufacturing/assembly, piezoelectric/electrostrictive device manufacturing/assembly, etc., can solve problems such as inability to meet practical applications

Inactive Publication Date: 2008-02-20
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Single-phase materials rarely have such characteristics, and only have magnetoelectric effects at low temperatures, which cannot meet the needs of practical applications at all.

Method used

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  • Method for improving magneto-electric effect of composite materials
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Embodiment Construction

[0027] As shown in Fig. 1, the object of main application research of the present invention is composite material, and this composite material is made of magnetostrictive material Terfenol-D and piezoelectric material LiNbO 3 Interlayer coupled 2-2 type composites composed of single crystals. Its magnetoelectric coupling is realized through the "product effect" of the magnetostrictive effect and the piezoelectric effect under the synergy of the phase interface, that is, the coupling of magnetism-force and force-electricity. The process can be visualized as:

[0028] Magnetoelectric = electric mechanical × mechanical magnetic , Thus we obtain the important characterization parameter of the magnetoelectric coupling effect, namely the magnetoelectric coupling coefficient, α H = ( ...

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Abstract

The invention relates to a method for improving the magnetoelectric effect of composite material, which prepares the magnetic deformation and the piezoelectric material into sheet composite material while they are adhered. It designs the cutting shape of piezoelectric single crystal according to the vibration mode of magnetic deformation material under the direct current bias magnetic field and alternating excited magnetic field, to make the cut piezoelectric single crystal attain high piezoelectric output under the strain effect processed by the magnetic deformation material; selecting the cutting shape of standard cut piezoelectric single crystal to attain the maximum piezoelectric factors of crystal; processing coordinate transformation on the piezoelectric tensor matrix of standard piezoelectric single crystal to make the piezoelectric factor integrated valve used in the new cut piezoelectric factor matrix reach maximum, and the new cut piezoelectric single crystal attain maximum piezoelectric output at needed direction to attain the maximum magnetoelectric effect.

Description

1. Technical field [0001] The invention relates to a design method and application for improving the magnetoelectric effect of a composite material, which mainly improves the magnetoelectric output by designing a new cut type of piezoelectric single crystal material in the magnetoelectric composite material. 2. Background technology [0002] The magnetoelectric coupling effect is that when the material is under the condition of an external magnetic field, it can produce electric polarization, or under the condition of an electric field, there is a phenomenon of magnetization. In 1894, Curie predicted the existence of magnetoelectric effect based on the consideration of crystal symmetry, but it was not until 1958 that Landau and Lifshitz confirmed the existence of magnetoelectric effect in some crystals. Subsequently, Dzyaloshinskii on the antiferromagnetic Cr 2 o 3 The symmetry of is discussed, it is considered that Cr 2 o 3 It has a magnetoelectric effect and has been v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/22B32B37/00H01L41/47
Inventor 朱劲松杨盼赵可尹媛万建国吕笑梅
Owner NANJING UNIV
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