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Coupling between different interactions allows to control physical aspects inmultifunctional materials by perturbing any of the degrees of freedom. Here, weaim to probe the correlation among structural, electronic and magneticobservables of Sm$ _{2} $NiMnO$ _{6} $ ferromagnetic insulator doubleperovskite. Our employed methodology includes thermal evolution of synchrotronX-ray diffraction, near edge and extended edge hard X-ray absorptionspectroscopy and bulk magnetometry. The magnetic ordering in SNMO adopts twotransitions, at T$ _{C} $=159.6K due to ferromagnetic arrangement of Ni-Mnsublattice and at T$ _{d} $=34.1K because of anti-parallel alignment ofpolarized Sm paramagnetic moments with respect to Ni-Mn network. The global aswell as local crystal structure of SNMO undergoes isostructural transitionsacross T$ _{C} $ and T$ _{d} $, observed by means of temperature dependentvariation in Ni/Mn-O, Ni-Mn bonding characters and super exchange angle inNi-O-Mn linkage. Hybridization between Ni, Mn 3\textit{d}, O 2\textit{p}electronic states is also modified in the vicinity of magnetic transition. Onthe other hand, the signature of Ni/Mn anti-site disorders are evidenced fromlocal structure and magnetization analysis. The change in crystal environmentsgoverns the magnetic response by imposing alteration in metal - ligand orbitaloverlap. Utilizing these complimentary probes we have found that structural,electronic and magnetic states are inter-coupled in SNMO which makes it apotential platform for technological usage.

Existence of inter coupled structural, electronic and magnetic states in Sm$ _{2} $NiMnO$ _{6} $ double perovskite