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We have investigated the magnetic state of Nd0.4Sr0.6MnO3 with the variationof its grain size down to average nanometric diameter (40 nm). The bulk sampleis antiferromagnetic (AFM) in nature. However, on reduction of the grain size,emergence of ferromagnetic behavior is experimentally observed. Linear andnonlinear ac magnetic susceptibility measurements reveal that ferromagneticnature is enhanced as the grain size is reduced. Large coercivity andbifurcation between zero field cooled and field cooled magnetization curvesindicate an intrinsic disorder and large anisotropy in the system. Observedbehaviors are attributed to surface disorder as well as to possible pressureeffect on nano grains.

Emergence Of Ferromagnetism In Nanoparticles Of Antiferromagnetic Nd0.4Sr0.6MnO3