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Combining experimental investigations and first-principles DFT calculations,we report physical and magnetic properties of Gd-substituted Y$_2$CoMnO$_6$double perovskite, which are strongly influenced by antisite-disorder-drivenspin configurations. On Gd doping, Co and Mn ions are present in mixed-valence(Co$^{3+}$, Co$^{2+}$, Mn$^{3+}$ and Mn$^{4+}$) states. Multiple magnetictransitions have been observed: i) paramagnetic to ferromagnetic transition isfound to occur at \textit{T}$_C$=95.5 K, ii) antiferromagnetic transition at\textit{T}$_N$=47 K is driven by $3d-4f$ polarisation and antisite disorderpresent in the sample, iii) change in magnetization below \textit{T}$\leq$20 K,primarily originating from Gd ordering, as revealed from our DFT calculations.AC susceptibility measurement confirms the absence of any spin-glass orcluster-glass phases in this material. A significantly large exchange biaseffect (\textit{H}$_{EB}$=1.07 kOe) is found to occur below 47 K due tointerfaces of FM and AFM clusters created by antisite-disorder.

The effect of antisite disorder on magnetic and exchange bias properties of Gd-substituted Y$_2$CoMnO$_6$ double perovskite