Herein, we have investigated magnetic and magnetocaloric effect (MCE) of Double Perovskite multiferroic Y_2NiMnO_6 Nanoparticle, prepared by successive microwave processing method. The sample is characterized by X-ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM). Magnetization (M) vs Temperature (T) shows a ferromagnetic (FM) to paramagnetic (PM) transition at Curie temperature (TC) ～ 82 K. A large value of magnetic entropy change (ΔSM) ～ 4.96 Jkg~(-1)K~(-1) and Relative cooling power (RCP) of 191.3 J kg~(-1) are observed across its TC due to filed change of 50 kOe. The material will be useful for commercial magnetic refrigeration.
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