摘要: We have recently shown that BiFeO3 has at least four different magnetic phases, contrary to the conventional wisdom. Below room temperature it undergoes spin reorientation transitions T2=200 K and T1=140 analogous those in orthoferrites; above a structural transition near 185°C first reported by Polomska et al. This may help explain apparent linear magnetoelectric effect 20°C D. Lebeugle [Phys. Rev. Lett. 100, 227602 (2008)] which is nominally forbidden due long wavelength cycloidal structure assumed. also find evidence of an unusual acentric glass below ca. 200 K, related not TN but T1 T2.
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