Temperature-dependent properties of the magnetic order in single-crystal BiFeO3

Abstract

We report neutron diffraction and magnetization studies of the magnetic order in multiferroic BiFeO3. 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 N¶eel temperature, at which, in addition, a small jump in magneti- zation 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 an- harmonicity is much smaller than previously reported in NMR studies. At room temperature, a circular cycloid is observed, within errors. We argue that the observed anharmonicity provides important clues for understanding electromagnons in BiFeO3.

In Press at PRB

References in corpus (5)

• Weak ferromagnetism and magnetoelectric coupling in bismuth ferrite
• Electric-field-induced spin-flop in BiFeO3 single crystals at room-temperature
• Electric-field control of spin waves at room temperature in multiferroic BiFeO3
• Optical coupling to spin waves in the cycloidal multiferroic BiFeO3
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