The nanocomposite Co 3 O 4 /CoFe 2 O 4 heterostructured mesoporous material was produced via a simple solid–solid reaction of an iron precursor with ordered mesoporous Co 3 O 4 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 57 Fe Mössbauer spectroscopy. The low-temperature magnetization loops of the Co 3 O 4 /CoFe 2 O 4 heterostructure present exchange bias under cooling in an applied magnetic field. The antiferromagnetic ordering temperature of Co 3 O 4 is increased due to the proximity of the hard magnetic CoFe 2 O 4 phase. The nanocomposite Co 3 O 4 /CoFe 2 O 4 behaves as an exchange coupled system with a cooperative magnetic switching.
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Tüysüz et al. (2012) studied this question.
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