Abstract
Magnetization studies on La0.5Gd0.2Sr0.3MnO3 (LGSMO) nanoparticles (∼20nm) reveal superparamagnetic phase associated with this system and thereby contrasting from cluster glass (CG) phase of its bulk counterpart. Doping of Gd on La sites and its antiferromagnetic coupling with Mn lattices are expected to induce random magnetic disorder in the magnetic lattice of LGSMO system. Study reveals that random magnetic disorder, which results in CG phase in an otherwise long range ordered ferromagnetic host matrix of bulk, does not have similar significant effect when the uniformity of the host matrix reduces to nanosize. On the contrary, analysis brings out that magnetic properties of LGSMO nanoparticles are primarily decided by its nanodimension having physical size of ∼20nm, which yield single domain magnetic entities of dimension of ∼12nm surrounded by a magnetic dead layer of ∼4nm.
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