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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Magnetically induced anisotropy of electric permittivity in the PDMS ferromagnetic gel
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Magnetically induced anisotropy of electric permittivity in the PDMS ferromagnetic gel

机译：PDMS铁磁凝胶中的磁感应各向异性

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摘要

A polymer ferromagnetic gel is an assembly of ferromagnetic nanoparticles embedded in a gel. The finely distributed magnetic particles of iron oxide (Fe_3O_4) were suspended, due to adhesive forces, in the flexible matrix (poly(dimethyl siloxane) PDMS). The mean diameter of the suspended nanoparticles, equal to 8.9 nm, was determined by means of a vibrating sample magnetometer. The dispersion of the electric permittivity, studied in the frequency range of 400 Hz-5 MHz, revealed the maxima at approximately 92 kHz and 2.5 MHz. The application of the homogenous magnetic field, ranging from 0 mT to 500 mT induced the anisotropy of the electric permittivity for the mutual parallel orientation of the magnetic field, electric field and the axis of the sample. For the magnetic induction B = 500 mT the highest decrease in the electric permittivity and the shift of the maximum from 2.5 toward 2.9 MHz were found.
机译：聚合物铁磁凝胶是嵌入在凝胶中的铁磁纳米粒子的集合体。由于粘附力，细分布的氧化铁磁性颗粒（Fe_3O_4）悬浮在柔性基质（聚（二甲基硅氧烷）PDMS）中。借助于振动样品磁力计测定悬浮的纳米颗粒的平均直径，等于8.9nm。在400 Hz-5 MHz的频率范围内研究的介电常数的色散显示出在大约92 kHz和2.5 MHz处的最大值。范围从0 mT到500 mT的均匀磁场的施加，导致了磁场，电场和样品轴相互平行定向时介电常数的各向异性。对于B = 500 mT的磁感应，发现介电常数的最大降低和最大值从2.5到2.9 MHz的偏移。

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