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Journal Article

Synthesis of Hard Magnetic Ordered Mesoporous Co3O4 /CoFe2O4 Nanocomposites

MPS-Authors
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Tüysüz,  Harun
Research Group Tüysüz, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Salabaş,  Elena-Lorena
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Bongard,  Hans
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Spliethoff,  Bernd
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Lehmann,  Christian W.
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth,  Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Tüysüz, H., Salabaş, E.-L., Bill, E., Bongard, H., Spliethoff, B., Lehmann, C. W., et al. (2012). Synthesis of Hard Magnetic Ordered Mesoporous Co3O4 /CoFe2O4 Nanocomposites. Chemistry of Materials, 24(13), 2493-2500. doi:10.1021/cm3005166.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-76AF-F
Abstract
The nanocomposite Co3O4/CoFe2O4 heterostructured mesoporous material was produced via a simple solid-solid reaction of an iron precursor with ordered mesoporous Co3O4 that had been prepared via nanocasting from mesoporous silica as hard template. The magnetic behavior of the exchange-coupled antiferromagnetic/ferrimagnetic (AFM/FM) system was investigated via superconducting quantum interference device (SQUID) magnetometry and 57Fe Mossbauer spectroscopy. The low-temperature magnetization loops of the Co3O4/CoFe2O4 heterostructure present exchange bias under cooling in an applied magnetic field. The antiferromagnetic ordering temperature of Co3O4 is increased due to the proximity of the hard magnetic CoFe2O4 phase. The nanocomposite Co3O4/CoFe2O4 behaves as an exchange coupled system with a cooperative magnetic switching.