Successive field-induced transitions in BiFeO${}_3$ around room temperature

Abstract

The effects of high magnetic fields applied perpendicular to the spontaneous ferroelectric polarization on single crystals of BiFeO${}_3$ were investigated through magnetization, magnetostriction, and neutron diffraction measurements. The magnetostriction measurements revealed lattice distortion of $2\times 10^{-5}$, during the reorientation process of the cycloidal spin order by applied magnetic fields. Furthermore, anomalous changes in magnetostriction and electric polarization at a larger field demonstrate an intermediate phase between cycloidal and canted antiferromagnetic states, where a large magnetoelectric effect was observed. Neutron diffraction measurements clarified that incommensurate spin modulation along [110] direction in the cycloidal phase becomes commensurate in the intermediate phase. Theoretical calculations based on the standard spin Hamiltonian of this material suggest an antiferromagnetic cone-type spin order in the intermediate phase.

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Cited by in corpus (4)

• Capacitive detection of magnetostriction, dielectric constant, and magneto-caloric effects in pulsed magnetic fields
• Direct coupling of ferromagnetic moment and ferroelectric polarization in BiFeO${}_3$
• Tensile deformations of the magnetic chiral soliton lattice probed by Lorentz transmission electron microscopy
• The Magnetoelastic Distortion of Multiferroic BiFeO${}_3$ in the Canted Antiferromagnetic State