Low-Symmetry Monoclinic Phases and Polarization Rotation Path Mediated by Epitaxial Strain in Multiferroic BiFeO3 Thin Films (pages 133–138)
Zuhuang Chen, Zhenlin Luo, Chuanwei Huang, Yajun Qi, Ping Yang, Lu You, Chuansheng Hu, Tom Wu, Junling Wang, Chen Gao, Thirumany Sritharan and Lang Chen
Article first published online: 25 NOV 2010 | DOI: 10.1002/adfm.201001867
Strain-mediated polarization rotation for BiFeO3 films is shown in the figure. Starting from the strain-free rhombohedral (R) phase, the strain-induced transition path is R to Ma by compressive strains or R to Mb by tensile strains. At large enough compressive strains, the Ma to Mc phase transition occurs and brings about a sudden increase in the c-lattice parameter. This new rotation path indicates a soft lattice for BiFeO3 and a tunable behavior by strains where the polarization rotation paths could be mediated in the same way as in those driven by electric field, chemical composition, pressure, and temperature.