Abstract
Magnetic study on La2CoMnO6 nanoparticles revealed multiple magnetic transitions at 218 K, 135 K, and below 38 K and the nature of the low temperature transition was unclear [J. K. Murthy and A. Venimadhav, J. Appl. Phys. 111, 024102 (2012)]. Presence of mixed valence states of Co and Mn has been confirmed from the X-ray photoelectron spectroscopy measurement and its presence along with antisite disorder affects in reducing the saturation magnetization of the nanoparticles. The zero-field-cooled and field-cooled bifurcation in dc magnetization, relaxation in zero-field-cooled magnetization, and large enhancement in coercive field below the glassy temperature have been discussed. Frequency dependence of ac susceptibility using power law has revealed cluster glass behaviour. Further, the dc field superimposed on ac susceptibility and absence of memory effect in ac susceptibility have suggested the existence of non-interacting clusters comprising of competing interactions below 38 K. Competing magnetic interactions due to the presence of mixed valences and antisite disorder found to establish a reentered cluster glassy state in the nanoparticles.
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