Open AccessExchange coupling between soft magnetic ferrite and hard ferromagnetic Sm2Fe17N3in ferrite/Sm2Fe17N3composites
Author(s) -
Nobuyoshi Imaoka,
E. Kakimoto,
Kenta Takagi,
Kimihiro Ozaki,
Masayoshi Tada,
T. Nakagawa,
Masanori Abe
Publication year - 2016
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4944519
Subject(s) - materials science , remanence , ferrite (magnet) , ferromagnetism , magnet , magnetization , coercivity , nuclear magnetic resonance , beta ferrite , condensed matter physics , metallurgy , composite material , microstructure , magnetic field , physics , austenite , quantum mechanics
In our previous work, we succeeded in fabricating ferrite/Sm2Fe17N3 composite magnets from explosive-consolidating Sm2Fe17N3 powders (2μm size) which were coated with a continuous iron ferrite layer (50nm thick) in an aqueous solution. The magnetization curves had no inflection, which suggests that the soft magnetic ferrite layer is exchange-coupled with the hard ferromagnetic Sm2Fe17N3 particles. In this paper, we provide evidence of exchange coupling in ferrite/Sm2Fe17N3 composites by the following means: 1) measurements of recoil permeability, 2) detailed microstructural observation and 3) calculations of the reduction in remanence due to the introduction of a ferrite layer in the Sm2Fe17N3 magnets. Our ferrite/Sm2Fe17N3 composite magnets are a novel type of spring magnet in which an insulating soft magnetic phase is exchange-coupled with hard magnetic phase
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