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Highly ordered macroporous magnetic materials prepared by electrodeposition through colloidal template
Author(s) -
Kim J. C.,
Kim Y. N.,
Hur N. H.,
Kim W. S.,
Kang Y. G.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200304547
Subject(s) - materials science , template , ferromagnetism , magnetization , colloid , spins , colloidal crystal , curie temperature , chemical engineering , nanotechnology , condensed matter physics , magnetic field , physics , quantum mechanics , engineering
We report magnetic properties of macroporous magnetic materials with highly ordered spherical voids prepared by an electrochemical technique. The interstitial sites in close‐packed arrays of colloidal silicas were filled by the electrodeposition of Fe, Co, and Fe 3 O 4 . The silica templates were removed by soaking the deposited templates into a 2% HF solution. SEM images of the template‐free macroporous magnetic materials clearly exhibit spherical voids arranged in a three dimensionally ordered structure. The magnetization curves of the Fe and Co films show a decreasing tendency with decreasing temperature, which might be associated with magnetic polarization and domain wall propagation. On the other hand, the Fe 3 O 4 film exhibits a typical ferromagnetic behavior but has the reduced Curie temperature, which is due to the 2D Heisenberg type of the Fe spins. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)