抄録
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 |
| 巻 | 43 |
| 発行部数 | 8 |
| DOI | |
| 出版物ステータス | Published - 1996 |
| 外部発表 | Yes |
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ASJC Scopus subject areas
- Mechanical Engineering
- Industrial and Manufacturing Engineering
- Metals and Alloys
- Materials Chemistry
これを引用
Magnetic characterization of bacterial magnetic particles. / Nishio, Hiroaki; Takahashi, Takeshi; Taguchi, Hitoshi; Kamiya, Shinji; Matsunaga, Tadashi.
：: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, 巻 43, 番号 8, 1996, p. 1036-1041.研究成果: Article
}
TY - JOUR
T1 - Magnetic characterization of bacterial magnetic particles
AU - Nishio, Hiroaki
AU - Takahashi, Takeshi
AU - Taguchi, Hitoshi
AU - Kamiya, Shinji
AU - Matsunaga, Tadashi
PY - 1996
Y1 - 1996
N2 - 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.
AB - 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.
KW - Activation volume
KW - Bacterial magnetic particles
KW - FeO
KW - Magnetic viscosity
KW - Mössbauer spectrum
KW - Rotational hysteresis
KW - Saturation magnetization
KW - Superparamagnetism
UR - http://www.scopus.com/inward/record.url?scp=0030218288&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0030218288&partnerID=8YFLogxK
U2 - 10.2497/jjspm.43.1036
DO - 10.2497/jjspm.43.1036
M3 - Article
VL - 43
SP - 1036
EP - 1041
JO - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
JF - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
SN - 0532-8799
IS - 8
ER -