Table of Contents
ISRN Nanotechnology
Volume 2014, Article ID 867139, 6 pages
http://dx.doi.org/10.1155/2014/867139
Research Article

Structural and Magnetic Properties of Microwave Assisted Sol-Gel Synthesized Manganite Nanoparticles

1Department of Physics, Payame Noor University, Tehran 19395-3697, Iran
2Department of Physics, Isfahan University of Technology, Isfahan 84156-83111, Iran

Received 24 November 2013; Accepted 31 December 2013; Published 10 February 2014

Academic Editors: G. F. Goya and L. Suber

Copyright © 2014 Mahin Eshraghi and Parviz Kameli. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The structural and magnetic properties of nanoparticles of (LSMO) were studied using powder X-ray diffraction (XRD), transmission electron microscope (TEM), and magnetic measurements. The XRD refinement result indicates that samples crystallize in the rhombohedral structure with R-3C space group. The dc magnetization measurements revealed that samples exhibit no hysteretic behavior at room temperature, symptomatic of the superparamagnetic (SPM) behavior. The results of ac magnetic susceptibility measurements show that the susceptibility data are not in accordance with the Néel-Brown model for SPM relaxation but fit well with conventional critical slowing down model which indicates that the dipole-dipole interactions are strong enough to cause superspin-glass-like phase in LSMO samples.