Nonlinear behavior of magnetic fluid in Brownian relaxation

Takashi Yoshida, Koutaro Ogawa, Anwarul K. Bhuiya, Keiji Enpuku

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

This study investigated the nonlinear behavior of magnetic fluids under high excitation fields due to nonlinear Brownian relaxation. As a direct indication of nonlinear behavior, we characterized the higher harmonics of the magnetization signal generated by the magnetic fluid. The amplitudes of the fundamental to the ninth harmonic of the magnetization signal were measured as a function of the external field. The experimental results were compared with numerical simulations based on the Fokker-Planck equation, which describes nonlinear Brownian relaxation. To allow a quantitative comparison, we estimated the size distribution and size dependence of the magnetic moment in the sample. In the present magnetic fluid, composed of agglomerates of Fe3O 4 particles, the magnetic moment was estimated to be roughly proportional to the diameter of the particles, in contrast to the case of single-domain particles. When the size distribution and the size dependence of the magnetic moment were taken into account, there was good quantitative agreement between the experiment and simulation.

Original languageEnglish
Title of host publication8th International Conference on the Scientific and Clinical Applications of Magnetic Carriers
Pages102-110
Number of pages9
Volume1311
DOIs
Publication statusPublished - Dec 1 2010
Event8th International Conference on the Scientific and Clinical Applications of Magnetic Carriers - Rostock, Germany
Duration: May 25 2010May 29 2010

Other

Other8th International Conference on the Scientific and Clinical Applications of Magnetic Carriers
CountryGermany
CityRostock
Period5/25/105/29/10

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Yoshida, T., Ogawa, K., Bhuiya, A. K., & Enpuku, K. (2010). Nonlinear behavior of magnetic fluid in Brownian relaxation. In 8th International Conference on the Scientific and Clinical Applications of Magnetic Carriers (Vol. 1311, pp. 102-110) https://doi.org/10.1063/1.3529998