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提出了一种以Fe3O4纳米颗粒和聚二甲基硅氧烷(PDMS)组成的复合材料为介质的平行板磁电容结构,并对其产生的磁电容效应的特点以及影响磁电容效应的因素进行了研究.对不同粒径的Fe3O4纳米颗粒按不同比例与PDMS混合形成的复合材料进行了测试.研究表明,与无磁场情况相比,在外磁场作用下,Fe3O4纳米颗粒/PDMS复合材料的电容值和介电损耗均发生了改变,产生了磁电容效应.由该复合材料磁电容效应所产生的电容变化量随着纳米颗粒混合浓度的增大而增大,并且当纳米颗粒粒径尺寸大于常温超顺磁临界尺寸时,材料的电容变化量随着颗粒尺寸的减小而增大.
A parallel plate magnetic capacitor structure based on Fe3O4 nanoparticles and PDMS composite was proposed. The characteristics of the magnetic capacitor effect and the factors affecting the magnetic capacitance effect were also studied. The results show that compared with non-magnetic field, the capacitance of Fe3O4 nanoparticles / PDMS composites under the action of external magnetic field is higher than that of Fe3O4 / PDMS nanocomposite And dielectric loss have changed, resulting in a magnetocapacitance effect.Considering the capacitance variation caused by the magnetic capacitance effect of the composite material with the increase of the concentration of nano-particles increases, and when the particle size of the nano-particles is larger than normal temperature Superparamagnetic critical dimension, the material of the capacitance changes as the particle size decreases.