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Here, we present a study of the influence of microstructure on the magneticproperties of polycrystalline samples of the La1.5Sr0.5CoMnO6 doubleperovskite, with primary attention to the spontaneous exchange bias effect, afascinating recently discovered phenomena for which some materials exhibitunidirectional magnetic anisotropy after being cooled in zero magnetic field.By sintering La1.5Sr0.5CoMnO6 at different temperatures, we obtained sampleswith distinct average grain sizes, ranging from 0.76(21) to 4.95(1.73) mu_m. Adetailed investigation of the material's structural, morphologic, electronic,and magnetic properties using X-ray powder diffraction, powder neutrondiffraction, X-ray absorption near edge structure spectroscopy, scanningelectron microscopy, and AC and DC magnetometry has revealed a systematicenhancement of the exchange bias effect with increasing the grain size and theintergrain coalescence. Our results regarding the strengthening of the exchangecoupling at the grain interfaces and its influence on the dynamics of the spinglass-like moments present in the samples are discussed.

Tuning the spontaneous exchange bias effect in La1.5Sr0.5CoMnO6 with sintering temperature