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We report magneto-dielectric properties of partially B-site orderedmonoclinic Tb2CoMnO6 double perovskite thin film epitaxially grown bymetalorganic aerosol deposition technique. Transmission electron microscopy andelectron energy loss spectroscopy mapping shows the presence and distributionof both Co2+ and Co3+ ions in the film, evidencing a partial B-site disorder,which was further confirmed by the observation of reduced saturationmagnetization at low temperatures. The ferromagnetic Curie temperature, TC=110K, is slightly higher as compared to the bulk value (100 K) probably due to anin plane tensile strain. Remarkably, a short range ordering of spins at T*~190K>>TC was established and assigned to the B-site disorder in the film. Twodifferent dielectric relaxation peaks have been observed; they merge at thesame temperature T* of short range spin correlations. Moreover, an unexpectedhigh temperature dipolar relaxor-glass-like transition at T~T* was observed, atwhich a coupling to short range magnetic correlations results in a 4%magneto-dielectric coupling.

Magneto-dielectric Effect in Relaxor Dipolar Glassy Tb2CoMnO6 Film