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Magnetic nanoparticles of La0.67Sr0.33MnO3 (LSMO) manganite with meanparticle sizes of 13, 16, 18 and 21 nm were prepared by the sol-gel method. Thecrystal structure and mean particle size of the synthesized powders wereestimated by X-ray diffraction (XRD) analysis using rietveld refinement andtransmission electron microscopy (TEM). Fourier transform infrared (FTIR)transmission spectroscopy revealed that stretching and bending modes areinfluenced by calcinations temperature. Dc magnetization versus magnetic fieldof the samples was carried out at room temperature. Magnetic dynamics of thesamples was studied by the measurement of ac magnetic susceptibility versustemperature at different frequencies and ac magnetic fields. Afrequency-dependent peak was observed in ac magnetic susceptibility versustemperature which is well described by Vogel-Fulcher and critical slowing downlaws, and empirical and parameters. By fitting the experimental data withVogel-Fulcher and critical slowing down laws, the relaxation time,characteristic temperature, magnetic anisotropy energy, effective magneticanisotropy constant and critical exponent zv have been estimated. The obtainedvalues of c1, c2, T0 and t0 from the Vogel-Fulcher law support of the presenceof strong interaction between magnetic nanoparticles. The values of zv and t0obtained from critical slowing down fit suggest the presence of superspin glassbehavior in LSMO nanoparticles of different sizes.

Particle size effect on magnetic properties of interacting La0.67Sr0.33MnO3 nanoparticles