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The double perovskite Y_2NiMnO_6 displays ferromagnetic transition at Tc = 81K. The ferromagnetic order at low temperature is confirmed by the saturationvalue of magnetization (M_s) and also, validated by the refined orderedmagnetic moment values extracted from neutron powder diffraction data at 10 K.This way, the dominant Mn4+ and Ni2+ cationic ordering is confirmed. Thecation-ordered P 21/n nuclear structure is revealed by neutron powderdiffraction studies at 300 and 10 K. Analysis of frequency dependent dielectricconstant and equivalent circuit analysis of impedance data takes into accountthe bulk contribution to total dielectric constant. This reveals an anomalywhich coincides with the ferromagnetic transition temperature (T_c).Pyrocurrent measurements register a current flow with onset near Tc and a peakat 57 K that shifts with temperature ramp rate. The extrinsic nature of theobserved pyrocurrent is established by employing a special protocolmeasurement. It is realized that the origin is due to re-orientation ofelectric dipoles created by the free charge carriers and not by spontaneouselectric polarization at variance with recently reported magnetism-drivenferroelectricity in this material

Ferromagnetism and the Effect of Free Charge Carriers on Electric Polarization in Y_2NiMnO_6 Double Perovskite