Fully epitaxial Fe3O4/BiFeO3 bilayers were deposited on (001) LaAlO3 and SrTiO3 by magnetron sputtering. BiFeO3 remained tetragonal on highly misfit-strain LaAlO3 substrates. Obvious exchange bias with a reciprocal relation to the thickness of ferromagnetic Fe3O4 was observed in the Fe3O4/tetragonal-like BiFeO3 (Fe3O4/T -BiFeO3) bilayers below ∼ 100 K which is similar to that of Fe3O4/rhombohedral-like BiFeO3 (Fe3O4/R-BiFeO3) bilayers. An unexpected enhancement of exchange bias from ∼ 160 Oe in Fe3O4/R-BiFeO3 to ∼ 320 Oe in the Fe3O4/T -BiFeO3 bilayer was observed at 3 K, which could be attributed to the enhanced Fe-O-Fe interfacial superexchange (SE) interaction induced by distorted T -BiFeO3.
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