Magnetic characterization of bacterial magnetic particles

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)1036-1041
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number8
Publication statusPublished - 1996
Externally publishedYes


  • Activation volume
  • Bacterial magnetic particles
  • FeO
  • Magnetic viscosity
  • Mössbauer spectrum
  • Rotational hysteresis
  • Saturation magnetization
  • Superparamagnetism

ASJC Scopus subject areas

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


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