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Ferroelectric size effects in multiferroic BiFeO3 thin films

2007; American Institute of Physics; Volume: 90; Issue: 25 Linguagem: Inglês

10.1063/1.2750524

1520-8842

Ying‐Hao Chu, Tianqi Zhao, M. P. Cruz, Qian Zhan, Pingxiong Yang, Lane W. Martin, Mark Huijben, Chan‐Ho Yang, F. Zavaliche, Haimei Zheng, R. Ramesh,

Underwater Acoustics Research

Ferroelectric size effects in multiferroic BiFeO3 have been studied using a host of complementary measurements. The structure of such epitaxial films has been investigated using atomic force microscopy, transmission electron microscopy, and x-ray diffraction. The crystal structure of the films has been identified as a monoclinic phase, which suggests that the polarization direction is close to ⟨111⟩. Such behavior has also been confirmed by piezoforce microscopy measurements. That also reveals that the ferroelectricity is down to at least 2nm.