Structure and spin dynamics of multiferroric BiFeO${}_3$

Abstract

Multiferroic materials have attracted much interest due to the unusual coexistence of ferroelectric and (anti-)ferromagnetic ground states in a single compound. They offer an exciting platform for new physics and potentially novel devices. BiFeO${}_3$ is one of the most celebrated of multiferroic materials with highly desirable properties. It is the only known room-temperature multiferroic with $T_{\mathrm{C}}\approx 1100\mathrm{K}$ and $T_{\mathrm{N}}\approx 650\mathrm{K}$, and exhibits one of the largest spontaneous electric polarisation, $P\approx 80\mu {C/cm}^2$. At the same time, it has a magnetic cycloid structure with an extremely long period of 630~Å, which arises from a competition between the usual symmetric exchange interaction and antisymmetric Dzyaloshinskii-Moriya (DM) interaction. There is also an intriguing interplay between the DM interaction and the single ion anisotropy. In this review, we have tried to paint a complete picture of bulk BiFeO${}_3$ by summarising the structural and dynamical properties of both spin and lattice parts, and their magneto-electric coupling.

Accepted as a Topical Review in Journal of Physics: Condensed Matter. 32 pages, 23 figures

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Cited by in corpus (2)

• Spin and lattice excitations of a BiFeO3 thin film and ceramics
• Pinning, Rotation, and Metastability of BiFeO${}_3$ Cycloidal Domains in a Magnetic Field