Magnetic characterization of bacterial magnetic particles

Hiroaki Nishio, Takeshi Takahashi, Hitoshi Taguchi, Shinji Kamiya, Tadashi Matsunaga

研究成果: Article

抜粋

The experimental results on Mössbauer measurement, chemical analysis (a ratio of Fe2+ to total Fe content), analyses of the rotational hysteresis loss (Wr) and the measurement of magnetic viscosity coefficient (Sv) for bacterial magnetic particles (BMP, particle diameter D=25-65 nm) were compared with those of Fe3O4 particles (D=18-45 nm) prepared by the chemical coprecipitated method. The value of saturation magnetization (Js) calculated from Mössbauer spectrum and the results of chemical analysis for BMP was 1.06×10-4 Wb m/kg. The curves of Wr/Ms versus H for BMP showed more sharp peaks than those of Fe3O4 particles. The rotational hysteresis integral (Rh) of BMP and Fe3O4 particles were 1.12 and 0.62, respectively. It was considered that they have different magnetization reversal mechanism. Sv value of BMP was 127 A/m, which was 50% smaller than that of Fe3O4 particles. The diameter (Dact) of activation volume (minimum unit volume of magnetization reversal) calculated from Sv and the critical diameter (Dc) obtained by considering the superparamagnetic behavior of BMP, were 39 and 22 nm, respectively. On the other hand, Fe3O4 particles had smaller Dact (31 nm) and Dc (18 nm). It may be concluded that the magnetic stability of BMP is better than that of Fe3O4 particles.

元の言語English
ページ(範囲)1036-1041
ページ数6
ジャーナルFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
43
発行部数8
DOI
出版物ステータスPublished - 1996
外部発表Yes

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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