Structure and spin dynamics of multiferroic BiFeO3

作者：Park Je Geun^*; Le Manh Duc; Jeong Jaehong; Lee Sanghyun

来源：Journal of Physics: Condensed Matter , 2014, 26(43): 433202.

DOI：10.1088/0953-8984/26/43/433202

• multiferroic
• crystal structure
• magnetic structure
• BiFeO3
• magnetoelectric coupling
• spin dynamics

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. BiFeO3 is one of the most celebrated multiferroic materials and has highly desirable properties. It is the only known room-temperature multiferroic with TC approximate to 1100K and TN approximate to 650 K, and exhibits one of the largest spontaneous electric polarisations, P approximate to 80 mu C cm(-2). At the same time, it has a magnetic cycloid structure with an extremely long period of 620 angstrom, which arises from competition between the usual symmetric exchange interaction and the antisymmetric Dzyaloshinskii-Moriya (DM) interaction. There is also an intriguing interplay between the DM interaction and single ion anisotropy K. In this review, we have attempted to paint a complete picture of bulk BiFeO3 by summarising the structural and dynamic properties of both the spin and lattice parts and their magneto-electric coupling.

• 出版日期2014-10-29