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Giant Coercive Field of Nanometer‐ Sized Iron Oxide
Author(s) -
Jin J.,
Ohkoshi S.,
Hashimoto K.
Publication year - 2004
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200305297
Subject(s) - materials science , nanocrystal , nanometre , iron oxide , nanocomposite , oxide , micelle , coercivity , hysteresis , nanotechnology , chemical engineering , nanoparticle , phase (matter) , iron oxide nanoparticles , composite material , metallurgy , condensed matter physics , chemistry , aqueous solution , organic chemistry , physics , engineering
Nanocrystals of iron oxide in a silica matrix exhibiting a giant H c value of 2.0 T at room temperature are reported. The nanocomposite was obtained by combining reverse‐micelle and sol–gel methods. The nanocrystals of iron oxide are composed of the ϵ‐Fe 2 O 3 phase, with rod‐like particles 100–140 nm long and 20–40 nm wide. The Figure shows the hysteresis curve of the nanocrystals.