Mössbauer and magnetic studies of MFe2O4(M = Co, Ni) nanoparticles

被引：0
|
作者：
N. S. Gajbhiye
Sayan Bhattacharyya
G. Balaji
R. S. Ningthoujam
Raj Kumar Das
Susmita Basak
J. Weissmüller
机构：
[1] Indian Institute of Technology,Department of Chemistry
[2] Forschungszentrum Karlsruhe,Institute of Nanotechnology
来源：
Hyperfine Interactions | 2005年 / 165卷
关键词：
ferrite; nanocrystalline; ferrimagnetism; cation distribution; surface effect;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Nanocrystalline MFe2O4 (M = Co, Ni) particles are synthesized by citrate precursor technique. Mössbauer and magnetic studies are carried out with the CoFe2O4 samples having particle sizes of 9, 14 and 30 nm and the NiFe2O4 samples having particle sizes of 9, 21 and 30 nm. The intrinsic magnetic parameters are found to vary with the particle size. The magnetic interactions and cation distribution present in these systems influence the room temperature Mössbauer parameters. Ferrimagnetic sextets are observed for all the different particle sizes. The observed reduction of the magnetic hyperfine field values with the decrease in the size of MFe2O4 particles are attributed to the intrinsic size effect and the canted spin structure at the surface of the nanoparticles.
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页码：153 / 159
页数：6
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