Magnetic Characterization of Bacterial Magnetic Particles.
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- Nishio Hiroaki
- Materials Research Center, TDK Corporation
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- Takahashi Takeshi
- Materials Research Center, TDK Corporation
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- Taguchi Hitoshi
- Materials Research Center, TDK Corporation
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- Kamiya Shinji
- Research and Development Center, TDK Corporation
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- Matsunaga Tadashi
- Tokyo University of Agriculture and Technology
Bibliographic Information
- Other Title
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- 磁性細菌AMB‐1から分離した磁性微粒子の磁気的性質
- ジセイ サイキン AMB-1 カラ ブンリシタ ジセイ ビリュウシ ノ ジキテ
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Abstract
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, Fe3O4particles had smaller Dact (31nm) and Dc (18nm). It maybe concluded that the magnetic stability of BMP is better than that of Fe3O4 particles.
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 43 (8), 1036-1041, 1996
Japan Society of Powder and Powder Metallurgy
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Details 詳細情報について
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- CRID
- 1390001206307710208
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- NII Article ID
- 10002012912
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 4012530
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed