TY - JOUR
T1 - Synthesis and magnetic properties of the size-controlled Mn-Zn ferrite nanoparticles by oxidation method
AU - Justin Joseyphus, R.
AU - Narayanasamy, A.
AU - Shinoda, K.
AU - Jeyadevan, B.
AU - Tohji, K.
N1 - Funding Information:
One of the authors (RJJ) acknowledges the partial financial assistance under the 21st Century COE Program on Water Dynamics, Tohoku University and the CSIR, Government of India for the award of SRF. The partial financial assistance from UGC and DST, Government of India through the special assistance program and through the project No. SR/S5/NM-23/2002, respectively is acknowledged.
PY - 2006/7
Y1 - 2006/7
N2 - Size-controlled Mn0.67Zn0.33Fe2O4 nanoparticles in the wide range from 80 to 20 nm have been synthesized, for the first time, using the oxidation method. It has been demonstrated that the particle size can be tailor-made by varying the concentration of the oxidant. The magnetization of the 80 nm particles was 49 A m2 kg-1 compared to 34 A m2 kg-1 for the 20 nm particles. The Curie temperatures for all the samples are found to be within 630±5 K suggesting that there is no size-dependent cation distribution. The critical particle size for the superparamagnetic limit is found to be about 25 nm. The effective magnetic anisotropy constant is experimentally determined to be 7.78 kJ m-3 for the 25 nm particles, which is about an order of magnitude higher than that of the bulk ferrite.
AB - Size-controlled Mn0.67Zn0.33Fe2O4 nanoparticles in the wide range from 80 to 20 nm have been synthesized, for the first time, using the oxidation method. It has been demonstrated that the particle size can be tailor-made by varying the concentration of the oxidant. The magnetization of the 80 nm particles was 49 A m2 kg-1 compared to 34 A m2 kg-1 for the 20 nm particles. The Curie temperatures for all the samples are found to be within 630±5 K suggesting that there is no size-dependent cation distribution. The critical particle size for the superparamagnetic limit is found to be about 25 nm. The effective magnetic anisotropy constant is experimentally determined to be 7.78 kJ m-3 for the 25 nm particles, which is about an order of magnitude higher than that of the bulk ferrite.
KW - A. Magnetic materials
KW - A. Nanostructures
KW - B. Chemical synthesis
KW - C. Mössbauer spectroscopy
KW - D. Magnetic properties
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U2 - 10.1016/j.jpcs.2005.11.015
DO - 10.1016/j.jpcs.2005.11.015
M3 - Article
AN - SCOPUS:33745847078
SN - 0022-3697
VL - 67
SP - 1510
EP - 1517
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
IS - 7
ER -