异型磁体/铁电复合材料中的电致变磁导及电致变阻抗效应  

Electric field-controlled permeability and impedance in a heterotypic composite of ferroelectrics/magnet with high permeability

作　　者：高剑森[1] 张宁[2] 

机构地区：[1]宿迁学院基础教学部,宿迁223800 [2]南京师范大学物理科学与技术学院,南京210097

出　　处：《物理学报》2009年第12期8607-8611,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10674071)资助的课题~~

摘　　要：利用应力变磁导与电致伸缩效应的乘积效应,设计和制备了一种新型的异型磁体/铁电复合材料,并研究了该材料的电磁耦合特性.在5kV/cm的恒定电场下,观察到接近40%的电致变磁导(电感)及相应的电致变阻抗效应存在于一个较宽的频域(50—1×105Hz)上.该电致变磁导(电感)及电致变阻抗显示了铁磁弛豫和铁电弛豫的联合效应.研究认为,该异型复合材料所显示的所有电磁耦合行为均可归因于电场诱导的材料中磁体内部应力场的变化.Using the product effect of electrostrain and piezopermeability,a novel and heterotypic composite of magnet/ferroelectrics has been developed and its electromagnetic coupling has been investigated. Under a constant electric field of 5 kV/cm,about 40% electric-field-induced changes of inductance and impedance have been observed over a wide range of frequency for the composites. The electric-field dependent inductance and impedance show a joint behavior of ferromagnetic and ferroelectric relaxation. Analysis shows that all the behaviors observed can be ascribed to the electric field-controlled variation of the internal stress in the composite.

关 键 词：电磁耦合 异型复合材料 应力变磁导 电致伸缩 

分 类 号：O482.41[理学—固体物理]