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We report on the observation of heteronuclear magnetic Feshbach resonances inseveral isotope mixtures of the highly magnetic elements erbium and dysprosium.Among many narrow features, we identify two resonances with a width greaterthan one Gauss. We characterize one of these resonances, in a mixture of$^{168}$Er and $^{164}$Dy, in terms of loss rates and elastic cross section,and observe a temperature dependence of the on-resonance loss rate suggestiveof a universal scaling associated with broad resonances. Our observations holdpromise for the use of such a resonance for tuning the interspecies scatteringproperties in a dipolar mixture. We further compare the prevalence of narrowresonances in an $^{168}$Er-$^{164}$Dy mixture to the single-species case, andobserve an increased density of resonances in the mixture.

Feshbach Resonances in an Erbium-Dysprosium Dipolar Mixture