|Table of Contents|

Influence of Piezoelectric Polarization Direction on theMagneto-Impedance Effect of Magnetoelectronic Composite Oscillator(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2020年02期
Page:
17-22
Research Field:
·物理学·
Publishing date:

Info

Title:
Influence of Piezoelectric Polarization Direction on theMagneto-Impedance Effect of Magnetoelectronic Composite Oscillator
Author(s):
Fan Tongsheng; Wang Wei
School of Physics and Technology,Nanjing Normal University,Jiangsu Provincial Key Laboratory ofPhotoelectric Technology,Nanjing 210023,China
Keywords:
magnetic impedance; length polarization; thickness polarization; resonant frequency; magnetic resolution
PACS:
O441.6 O482.52+6
DOI:
10.3969/j.issn.1001-4616.2020.02.004
Abstract:
In this paper,the magnetoimpedance effect of magnetoelectric composite oscillators with piezoelectric bodies polarized along their length and thickness is studied. Based on the polarization theory of piezoelectric body,i.e. Lorentz model and Debye model,the relationship between effective relative permittivity of the magnetoelectric composite oscillator and magnetic field is studied by using the magnetoelectric coupling theory. The variation of effective relative permittivity with magnetic field is simulated numerically. Based on the relationship between the magnetic impedance of the magnetoelectric composite oscillator and effective relative permittivity,the magnetoimpedance effect of the magnetoelectric composite oscillator at the resonant frequency is theoretically analyzed. The magnetic impedance effect of “sandwich”structure magnetoelectric composite oscillator is experimentally studied. The experimental results show that when the magnetic field in the range of 0～50 mT and at the resonant frequency,the polarization direction of the piezoelectric body is the length polarization,the change rate of the magneto-impedance with the magnetic field is 22 times that of the thickness polarization. The experimental results are basically consistent with the theoretical simulation. On this basis,magnetic resolution of the experimental results is calculated at the resonant frequency,the magnetic resolution of the piezoelectric body length polarization magnetoelectric composite oscillator is 2.76×10-12 T/μΩ and the magnetic resolution of the piezoelectric body thickness polarized magnetoelectric composite oscillator is 78×10-12 T/μΩ. This study provides a theoretical basis for the detection of geomagnetic fields.

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Last Update: 2020-05-15