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Home > Issues > SearchEffect of Nucleation and Growth Dynamics on Saturation Magnetization of Chemically Synthesized Fe Nanoparticles
(Department of Electronic Engineering, Graduate School of Engineering, Tohoku University), K. Seto (Department of Electronic Engineering, Graduate School of Engineering, Tohoku University), D. Hasegawa (Department of Electronic Engineering, Graduate School of Engineering, Tohoku University), H. T. Yang (Department of Electronic Engineering, Graduate School of Engineering, Tohoku University), H. Kura (Department of Electronic Engineering, Graduate School of Engineering, Tohoku University), M. Doi (Department of Electronic Engineering, Graduate School of Engineering, Tohoku University), M. Takahashi (Department of Electronic Engineering, Graduate School of Engineering, Tohoku University) In order to obtain mono-dispersed Fe NPs with high saturation magnetization, quantitative analysis method to
investigate the growth dynamics of the Fe NPs synthesized by a conventional thermal decomposition method
has been developed. As a result, fast nucleation process promotes formation of ~4 nm of initial nucleus with a
non-equilibrium phase, resulting in low saturation magnetization. And slow particle growth with atomic-scaled
surface precipitation mode (< 100 atoms/(min·nm2)) can form the growth layer on the surface of initial nucleus
with high saturation magnetization (~190 emu/gFe) as an equilibrium a phase of Fe. Therefore, higher stabilization of small initial nucleus generated just after the injection of Fe(CO)5 should be one of the key issues to achieve much higher Ms of Fe NPs.
