期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 252, 期 1-3, 页码 71-73出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-8853(02)00718-7
关键词
ferrofluids; dielectric spectroscopy; magnetodielectric anisotropy; hopping; relaxation; frequency dependence
We have conducted broadband, temperature-dependent dielectric spectroscopy on ferrofluids of various concentrations. We study the change of the permittivity on application of a homogeneous magnetic field (approximate to0.5 T, parallel or orthogonal). The results reveal that the field-induced magnetodielectric effect is markedly frequency dependent and should be attributed to two different mechanisms: The structural anisotropy affects not only the interfacial polarisation of the nanoparticles, but also the strength of the hopping process observed in the samples. Both these effects influence the low-frequency permittivity values. High-frequency measurements should be used to derive information on the microstructure by means of effective media analysis. (C) 2002 Elsevier Science B.V. All rights reserved.
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