Temperature-dependent properties of the magnetic order in single-crystal BiFeO 3

摘要: We report neutron diffraction and magnetization studies of the magnetic order in multiferroic BiFeO${}_{3}$. In ferroelectric monodomain single crystals, there are three cycloidal domains with propagation vectors equivalent by crystallographic symmetry. The cycloid period slowly grows increasing temperature. domain populations do not change temperature except close vicinity N\'eel temperature, at which, addition, a small jump is observed. No evidence for spin-reorientation transitions proposed previous Raman dielectric found. slightly anharmonic $T=5$ K. anharmonicity much smaller than previously reported nuclear resonance studies. At room circular observed, within errors. argue that observed provides important clues understanding electromagnons