Synthesis of Hard Magnetic\nOrdered Mesoporous Co&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;/CoFe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; Nanocomposites

Harun Tüysüz (1476535); Elena Lorena Salabaş (2066407); Eckhard Bill (1309914); Hans Bongard (1724281); Bernd Spliethoff (1534543); ChristianW. Lehmann (1910146); Ferdi Schüth (1534537)

JOURNAL ARTICLE

Synthesis of Hard Magnetic\nOrdered Mesoporous Co3O4/CoFe2O4 Nanocomposites

Harun Tüysüz (1476535)Elena Lorena Salabaş (2066407)Eckhard Bill (1309914)Hans Bongard (1724281)Bernd Spliethoff (1534543)ChristianW. Lehmann (1910146)Ferdi Schüth (1534537)

Year: 2016 Journal: OPAL (Open@LaTrobe) (La Trobe University) Publisher: La Trobe University

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Abstract

The nanocomposite Co3O4/CoFe2O4 heterostructured mesoporous material was produced\nvia a simple\nsolid–solid reaction of an iron precursor with ordered mesoporous\nCo3O4 that had been prepared via nanocasting\nfrom mesoporous silica as hard template. The magnetic behavior of\nthe exchange-coupled antiferromagnetic/ferrimagnetic (AFM/FM) system\nwas investigated via superconducting quantum interference device (SQUID)\nmagnetometry and 57Fe Mössbauer spectroscopy. The\nlow-temperature magnetization loops of the Co3O4/CoFe2O4 heterostructure present exchange bias\nunder cooling in an applied magnetic field. The antiferromagnetic\nordering temperature of Co3O4 is increased due\nto the proximity of the hard magnetic CoFe2O4 phase. The nanocomposite Co3O4/CoFe2O4 behaves as an exchange coupled system with a cooperative\nmagnetic switching.

Keywords:

Nanocomposite Mesoporous material Magnetization Heterojunction Mesoporous silica Magnetic nanoparticles Magnetite Nanoparticle Mesoporous organosilica

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Mesoporous Materials and Catalysis

Physical Sciences → Materials Science → Materials Chemistry

Magnetic Properties and Synthesis of Ferrites

Physical Sciences → Materials Science → Materials Chemistry

Iron oxide chemistry and applications

Physical Sciences → Energy → Renewable Energy, Sustainability and the Environment

Synthesis of Hard Magnetic\nOrdered Mesoporous Co<sub>3</sub>O<sub>4</sub>/CoFe<sub>2</sub>O<sub>4</sub> Nanocomposites

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