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

M. Ramazanoglu*, W. Ratcliff, Y. J. Choi, Seongsu Lee, S. W. Cheong, V. Kiryukhin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)


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

Original languageEnglish
Article number174434
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
Publication statusPublished - 23 May 2011
Externally publishedYes


FundersFunder number
National Science Foundation
Directorate for Mathematical and Physical Sciences1004568, 0804109


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