Abstract
The interfacial coupling in epitaxially grown bilayers composed of paramagnetic CaIrO3 and ferromagnetic LaMnO3 bilayers has been shown to give rise to an unexpected exchange bias effect. Systematic magnetic measurements ascribe this effect to the existence of an interfacial spin-cluster-like state in the bilayers. Furthermore, by tuning the epitaxial strains in the bilayers with different growth sequences, a much stronger exchange bias effect is observed in the CaIrO3/LaMnO3 bilayer rather than the LaMnO3/CaIrO3 bilayer, revealing the indispensable role of epitaxial strains in engineering the interfacial coupling.
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