Journal of the Magnetics Society of Japan
Online ISSN : 1882-2932
Print ISSN : 1882-2924
ISSN-L : 1882-2924
Thin Films, Fine Particles, Multilayers, Superlattices
Synthesis and Analyses of Acicular Spinel Iron Oxide Particles with Core-Shell Structure Containing Manganese Ferrite and Magnetite
S. YamadaM. KishimotoH. Yanagihara
ジャーナル オープンアクセス

2023 年 47 巻 1 号 p. 15-19


  Acicular spinel iron oxide particles with a core-shell structure containing manganese ferrite (MnFe2O4) and magnetite (Fe3O4) were synthesized by uniformly crystallizing MnFe2O4 on the surface of the magnetite particles in an alkaline dispersion. Crystallizing 50 wt% of MnFe2O4 on Fe3O4 led to an increase in the apparent lattice constant from 0.839 nm to 0.841 nm. Transmission electron microscopy (TEM) observations of the particle shape and lattice images showed that MnFe2O4 was uniformly crystallized on the surface of the magnetite particles and their acicular shape was maintained. The coercive force and saturation magnetization were almost constant at 29.5 kA/m and 80-81 Am2/kg, respectively, when the crystallized MnFe2O4 content ranged from 0 to 30 wt%. When the MnFe2O4 content was increased to 50 wt%, the coercive force and saturation magnetization slightly decreased to approximately 28.0 kA/m and 74.1 Am2/kg, respectively, reflecting the lower magnetization of MnFe2O4 compared to that of Fe3O4.

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