电容型磁阻抗效应的退磁因子影响研究  

Effect of Demagnetizing Factor on Capacitive Type Magnetoimpedance Effect

作　　者：何文强[1] 樊通声 王巍[1,2] He Wenqiang;Fan Tongsheng;Wang Wei(School of Physics and Technology,Nanjing Normal University,Nanjing 210023,China;Laboratory of Modem Acoustics of MOE,Nanjing University,Nanjing 210093,China)

机构地区：[1]南京师范大学物理科学与技术学院,江苏南京210023 [2]近代声学教育部重点实验室南京大学,江苏南京210093

出　　处：《南京师大学报（自然科学版）》2018年第2期33-38,共6页Journal of Nanjing Normal University(Natural Science Edition)

基　　金：江苏省研究生科研与实践创新计划项目(KYCX17_1058)

摘　　要：研究了室温下磁致伸缩材料的退磁因子对磁电复合振子磁阻抗效应的影响.设计了长方体和四方体两种磁致伸缩板与相同压电板构成磁电复合振子,在磁电复合振子谐振和反谐振频率下,研究了退磁因子对其磁阻抗、磁电容、磁电感的影响.在谐振频率下,磁电复合振子的阻抗、电容、电感随磁场的变化趋势基本相似,但磁致伸缩为长方体时,磁电复合振子的阻抗、电容、电感达到饱和所需磁场明显小于磁致伸缩为四方体的复合振子达到饱和所需磁场.在反谐振频率下,退磁因子对阻抗和电感随磁场变化的影响与谐振频率基本相同,但退磁因子对磁电容的影响行为明显不同,四方体的磁电复合振子电容在H=1 600 Oe和H=1 700 Oe之间出现震荡,磁电容高达44 000%,而长方体复合振子没有振荡现象.从磁学的观点,理论分析了退磁因子对磁电复合振子磁阻抗效应的影响,该研究为磁场传感器在低磁场探测方面提供了实验及理论基础.The influence of the magnetostriction materials demagnetization factor at room temperature on the magnetoim-pedance effect of magnetoelectric composite oscillator is presented. Rectangular TDF and square TDF combine with the same piezoelectric PZT designed to form a magnetic composite oscillator, respectively. We compare the influence of demagnetization factor on magnetoimpedance,magnetocapacitance and magnetoinductance at resonance and anti-resonance frequencies. It was found that the variation of impedance, capacitance and inductance are basically similar with a dc magnetic field at resonance frequency. However,when the magnetostriction plate is rectangular,the impedance,capacitance and inductance of the magnetoelectric composite vibrator reaching to saturation required less magnetic fields than that of magnetostriction plate which is square. In the anti-resonance frequency,the influence of the demagnetization factor on the impedance and inductance varying with the magnetic field is basically same as that of resonance frequency except for capacitance. When the magnetostriction plate is square,the magnetoelectric composite oscillator capacitance fluctuates with the magnetic field intensity between 1 600 Oe and 1 700 Oe at anti-resonance frequency,and the magnetocapacitance is up to 44 000 %. Considering magnetism,the effect of demagnetization factor on magnetoimpedance is analyzed theoretically. The study provides experimental and theoretical basis for magnetic field sensors in low magnetic detection.

关 键 词：退磁因子 磁电复合振子 磁阻抗 谐振频率 反谐振频率 

分 类 号：O441.6[理学—电磁学] O482.526[理学—物理]