Combustion synthesis and magnetic investigation of nanosized CoFe2O4 |
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Authors: | Zhigang Xu Fuxiang Cheng Biao Zhou Chunsheng Liao Chunhua Yan |
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Affiliation: | State Key Laboratory of Rare Earth Materials Chemistry and Appli- cations, PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871 ,China |
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Abstract: | Nanosized Co spinel ferrite was prepared by a combustion method. The grain size of resultant ferrite can be controlled by the reaction conditions. Magnetic investigation revealed that the products with an average grain size of 4 nm behave as superparamagnetic materials and have zero coercive force; whereas the samples with an average grain size of 85 nm (near the size of critical single domain) have the maximal coercive force. There were the negative magnetic intergrain interactions which became stronger when the grain size neared that of the single domain. |
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Keywords: | combustion method Co spinel ferrite magnetic interaction nanometer materials |
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