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对由Fe3O4纳米颗粒-聚二甲基硅烷(PDMS)聚合物材料所组成纳米复合材料磁电容特性进行了研究,提出了该复合材料的制备方法,并对其进行了表征、磁化特性测试以及零磁场环境下介电特性测试;分析了该复合材料的相对介电常数随环境磁场的变化关系以及具有不同含量、粒径纳米颗粒的复合材料磁电容特性差异.实验结果显示,该复合材料的相对介电常数随环境磁场的增大而增大,其变化曲线有一定的滞后特性;复合材料的相对介电常数变化量随材料中纳米颗粒粒径以及含量的增大而增大,但含有较大颗粒复合材料的相对介电常数变化曲线具有较大的滞后性.研究表明,该复合材料在环境磁场中能够产生磁电容效应,其相对介电常数随环境磁场的变化率、饱和值以及滞后性都会受到材料中包含的纳米颗粒的含量以及磁化特性(磁导率、饱和磁化强度、矫顽力)所影响.
The magnetic capacitance characteristics of nanocomposites composed of Fe3O4 nanoparticle-polydimethylsilane (PDMS) polymer materials were studied. The preparation method of the composites was proposed and characterized. The magnetization characteristics test and zero Magnetic field environment dielectric properties test; analysis of the relative dielectric constant of the composite material with the environmental magnetic field changes as well as with different content, particle size of the composite magnetic capacitance characteristics of the difference.The experimental results show that the composite material relative The dielectric constant increases with the increase of the ambient magnetic field, and the variation curve of the dielectric constant has certain hysteresis characteristics. The relative dielectric constant of the composite material increases with the increase of the particle size and content of the nano-particles in the material, The relative dielectric constant curve of large particle composites has a large hysteresis.The results show that the composite material can produce magnetic capacitance effect in the environmental magnetic field, the relative permittivity of the composite material changes with the rate of change of the environmental magnetic field, the saturation value and the hysteresis Sex is affected by the amount of nanoparticles contained in the material as well as the magnetization (permeability, saturation magnetization, coercivity) .