摘要
Nanocrystalline (Ni 0·5Zn 0·5) xCo 12xFe 2O 4 with 0(x(1·0 are prepared by spraying co-precipitation method. Their microstructure and magnetic properties are investigated. The results show that nanocrystalline (Ni 0·5Zn 0·5) xCo 12xFe 2O 4 ferrites are spinel phase. Coercivity and retentivity of specimens increase with cobalt content. The enhancement of the saturation magnetisation up to a maximum value of 102·1 A m2 kg21 in nanocrystalline (Ni 0·5Zn 0·5)0·5Co0·5Fe 2O 4 ferrite is observed. This can be attributed to the change of the net magnetic moment between the sublattices of structure for the substitution of Ni 2+ and Zn 2+ ions with Co2z ions. The coercivity of nanocrystalline (Ni 0·5Zn 0·5) 0·5Co0·5Fe 2O 4 ferrite increases monotonously in the grain size regime d,69 nm, and then coercivity decreases with grain size. The initial increase in coercivity of the nanocrystalline (Ni 0·5Zn 0·5)0·5Co0·5Fe 2O 4 ferrite with increasing size is due to the enhanced role of the surface and its strong random anisotropy.
源语言 | 英语 |
---|---|
页(从-至) | 170-174 |
页数 | 5 |
期刊 | Materials Research Innovations |
卷 | 16 |
期 | 3 |
DOI | |
出版状态 | 已出版 - 6月 2012 |