1. Magnetic Properties of Helicobacter Pylori Ferritins Genetically Prepared Under Different Biomineralization Conditions
- Author
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Ki-Myung Kim, Sungwon Yoon, K. J. Cho, B. J. Suh, Kwanghyo Son, Jun-Mu Park, and Z. H. Jang
- Subjects
Materials science ,Magnetic moment ,biology ,Relaxation (NMR) ,02 engineering and technology ,Coercivity ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,Magnetic field ,Ferritin ,Magnetization ,Hysteresis ,Nuclear magnetic resonance ,0103 physical sciences ,biology.protein ,Brillouin and Langevin functions ,Electrical and Electronic Engineering ,010306 general physics ,0210 nano-technology - Abstract
Magnetic properties of bio-magnetic molecule ferritin have been investigated. Two ferritin samples were synthesized under different magnetic fields, 0 and 9.4 T, respectively. This work is focused on the influence of magnetic field on biomineralization process. While magnetization vs. temperature (M-T) data of both samples measured at 1000 Oe are almost identical except for low temperature region (T ＜ 6 K), magnetization vs. field (M-H) data show noticeable difference. From an analysis of M-H data by using a modified Langevin function, we could extract the saturation magnetization m₀(T), the effective magnetic moment μeff (T) and the linear susceptibility χ(T). The difference between the samples is most prominent in the χ(T), whereby the χ(T) of the sample prepared at 9.4 T is 1.7 times bigger than that of the other. In addition, from hysteresis and relaxation measurements, we found the sample prepared at 9.4 T showed strikingly smaller coercivity and slower relaxation.
- Published
- 2016
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