Abstract
The low temperature dynamics of Pr0.5Sr0.5MnO3 nanoparticles is studied through magnetic memory, relaxation and aging measurements. These nanoparticles are prepared through chemical method with an average size of 15 nm. This system shows memory effect in dc magnetization. The measured magnetic relaxation exhibits logarithmic dependence with time. These results are in favor of interparticle interactions which induce the collective behavior in these nanoparticles. The aging experiments show that magnetic relaxation does not depend on given wait time prior to application of field, thus distinguishing the dynamics of this system from that of spin glass. However, the magnetic relaxation measured with positive and negative temperature cycle shows asymmetric response. This suggests that dynamics of these nanoparticles can be explained invoking hierarchical model rather than droplet model, commonly used in describing the dynamics of glassy systems, which is quite intriguing.
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