Abstract
AbstractTemperature dependence of the ferromagnetic resonance (FMR) spectra of magnetic nanoparticles or agglomerates of γ‐Fe2O3 in nonmagnetic matrixes has been studied. Samples with two types of magnetic nanofillers have been studied: a solid powder and a suspension. Magnetic anisotropy present in the samples allowed analysis of the observed FMR spectrum in terms of two lines arising from the perpendicular (the more intense) and parallel (the weaker) components of the resulting dipolar field. It was observed that the temperature changes of the resonance lines have been effected by the presence of critical phenomena in polymer matrix, especially the freezing processes connected with the arrested movements of certain matrix fragments. A simple model has been put forward to explain partially the shift of the resonance field with the temperature change. It is proposed that an essential part (50%) of the temperature shift of the position of FMR resonance could be caused by change of an effective magnetic moment due to thermal expansion of the matrix. Application of low concentration of magnetic nanoparticles in the polymeric systems, especially possessing extraordinary physical properties, would allow studying them by the FMR method. This might be very helpful for understanding of the critical or exotic phenomena observed in certain materials. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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