| Nanostructured Multiferroics |
| Partha Hajra, Ramaprasad Maiti** and Dipankar Chakravorty* |
| Abstract |
| Multiferroic materials exhibit both ferromagnetic and ferroelectric order. Single phase multiferroics are rare in nature. Also the magnetodielectric coupling parameters exhibited by them are not large enough for practical applications. There has been active research in the last few years to synthesize nanoscale composites of ferroelectric and ferromagnetic systems. In this article we have reviewed the recent developments in this area. The composites described have a range of nanostructural configurations, viz. core-shell nanostructure, particulate composites, glass-crystal nanocomposites, nanocomposte films and nanocomposites made by using Na-4 mica nanochannels. Nanocomposite films have shown high magnetodielectric effect. Some unusual systems like nanostructured Co3O4 and GaN have exhibited multiferroic behaviour with the latter showing a giant magnetodielectric effect. It is expected that by a suitable choice of combination of the matrix phase and the nanophase one could tune the magnetodielectric behaviour to suit a particular application. |
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