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Epitaxial growth and magnetic properties of layered cobaltite Sr1.5Pr0.5CoO4 thin film

We have studied magnetic behaviour of pulsed laser grown epitaxial thin film of layered compound Sr1.5Pr0.5CoO4 (SPCO) on LaAlO3 [001] substrate. Co-2p core level x-ray photoemission spectra mimics the mixed valence state of Co in the grown film. Arrot plots analysis implies that the magnetization of the system obeys mean field type behavior. Our study suggests that the low temperature magnetic behavior of SPCO can be classified as anisotropic ferromagnetic state, manifested through the analysis of thermo-magnetic irreversibility and cusp in ZFC magnetization (M–T) as well as absence of zero field cooled memory effect. In addition, our study confirms that there is no exchange bias effect in the material. Time dependence of the magnetization relaxation behavior reveals the existence of multiple metastable magnetic states in the system. Slow relaxation of magnetization and aging effect are found to be described by a hierarchical model.