We report the fabrication of BiFeO 3 /BiCrO 3 (111) artificial superlattices with 1/1 stacking in a layer-by-layer growth mode on atomically flat SrTiO 3 (111) surfaces. While BiFeO 3 and BiCrO 3 are antiferromagnets having Fe–O–Fe and Cr–O–Cr bonds, these superlattices contain Fe–O–Cr bonds, in which ferromagnetic interaction is expected. Magnetization measurements at 300 K revealed that the magnetic moment per transition metal ion was 1.7 µ B , suggesting ferromagnetic spin order. Ferroelectric behavior at room temperature was confirmed by an analysis using a scanning non-linear dielectric microscope.
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Ichikawa et al. (2008) studied this question.
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