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The structural, electronic and magnetic properties of anti-site disorderedSm$ _{2} $NiMnO$ _{6} $ double perovskite has been studied. RE$_{2}$NiMnO$_{6}$(RE: rare-earth) ordered double perovskite is commonly believed to show twodistinct magnetic phase transitions viz, paramagnetic to ferromagnetic (FM)transition at T = T$ _{C} $ due to Ni-O-Mn super exchange interaction andanother transition at T = T$ _{d} $ due to coupling of RE spins with Ni-Mnnetwork. In our present study, we have observed that the presence of intrinsicB-site disorder results in an additional antiferromagnetic (AFM) coupling,mediated via Ni-O-Ni and Mn-O-Mn local bond pairs. As a consequence, themagnetic behavior of SNMO comprises of co-existing FM-AFM phases, which arerespectively governed by the anti-site ordered and disordered structures. Fielddependent inverted cusp like trend in M(T) and two step reversible loopbehavior in M(H) measurements indicate the presence of competing FM-AFM phasesover a wide range of temperature values (T$ _{d} < $ T $ < $ T$ _{C} $).

Magnetic properties of disordered polycrystalline bulk Sm$ _{2} $NiMnO$ _{6} $ double perovskite