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无机材料学报

无机材料学报

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等静压力下MnZn铁氧体的压磁导效应和压阻抗效应

高剑森1， 张 宁2
  

  1. 1. 江苏省宿迁学院 基础教学部, 宿迁 223800; 2. 南京师范大学 磁电子学实验室，南京 210097
  • 收稿日期:2008-05-13 修回日期:2008-06-13 出版日期:2009-01-20 网络出版日期:2009-01-20

Giant Piezomagnetism and Piezoimpedance Effects in MnZn FerriteDevice under Hydrostatic Pressure

GAO Jian-Sen1, ZHANG Ning2   

  1. 1. Basic Teaching Department, Suqian College of Jiangsu Province, Suqian 223800, China; 2. Magnetoelectronic Lab, Nanjing Normal University, Nanjing 210097, China
  • Received:2008-05-13 Revised:2008-06-13 Published:2009-01-20 Online:2009-01-20

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1891

被引次数

1

摘要： 研究了高磁导MnZn铁氧体在等静压力下的压磁导效应、以及相应器件中不依赖于趋肤效应的压阻抗效应.在几个兆帕的压力下同时观测到其巨大的压磁导效应及压阻抗效应.当频率低于1kHz时，随信号频率的增大，上述压磁导效应及压阻抗效应会分别经历一个最大值.对于磁导率介于5000~15000范围内的MnZn铁氧体，在6MPa的压力下，压阻抗效应均可超过60％.分析显示，上述压力效应是由于外部压力导致铁氧体内应力改变，以致磁化状态改变所致.

关键词: 压磁导效应, 压阻抗效应, 高磁导材料

Abstract: The effects of hydrostatic pressure on the magnetism and impedance of a manganese zinc ferrite device were investigated. Both giant piezopermeability and piezoimpedance which were independent of skin effect were observed simultaneously under pressure of a few million-pascals (MPa). With increasing frequency of the current applied across the search coil of the ferrite device, these pressure effects are found to undergo a maximum at frequency of about 1kHz. Under pressure of 6MPa, piezoimpedance over 60% is observed for the ferrite devices with the permeabilities ranging from 5000 to 15000. Analysis shows that these pressure effects result from the variation of the interior stress and the magnetization of the ferrite induced by the applied pressure.

Key words: piezopermeability effect, piezoimpedance effect, materials with high permeability

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