The utility of electrical resistivity as an indicator magnetoionic performance in stoichiometrically and structurally similar thin-film systems is demonstrated. A series highly nanocrystalline cobalt nitride ($\mathrm{Co}\text{\ensuremath{-}}\mathrm{N}$) thin films (85 nm thick) with a broad range properties exhibit markedly different behaviors. Semiconducting, near stoichiometric $\mathrm{Co}\...
