Ferroelastic domain identification in BiFeO3 crystals using Raman spectroscopy
Ferroelastic domain identification in BiFeO3 crystals using Raman spectroscopy
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DOI：
10.1038/s41598-018-36462-5
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发表时间：
2019-01-23
影响因子：
4.6
通讯作者：
Alexe, Marin
中科院分区：
文献类型：
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作者：
Himcinschi, Cameliu;Rix, Jan;Alexe, Marin
利用激光波长为442 nm（共振条件）和633 nm（非共振条件）的显微拉曼光谱研究了BiFeO3晶体的多铁性。的方位角依赖的拉曼模式的强度允许它们的对称性分配。实验数据与基于拉曼张量理论的模拟结果一致。考虑到晶体光轴沿沿着伪立方方向的取向，混合对称性被考虑在内。强各向异性的强度变化的一些极性拉曼模式被用于线扫描和映射，以确定铁弹域图案。用不同的激发波长和因此不同的信息深度进行的线扫描指示畴壁相对于样品表面的倾斜。用拉曼光谱得到的畴分布与电子背散射衍射的结果非常一致。
Multiferroic BiFeO3 crystals were investigated by means of micro-Raman spectroscopy using the laser wavelengths of 442 nm (resonant conditions) and 633 nm (non-resonant conditions). The azimuthal angle dependence of the intensity of the Raman modes allowed their symmetry assignment. The experimental data are consistent with a simulation based on Raman tensor formalism. Mixed symmetries were taken into account, considering the orientation of the crystal optic axis along a pseudo-cubic direction. The strong anisotropic intensity variation of some of the polar Raman modes was used for line scans and mappings in order to identify ferroelastic domain patterns. The line scans performed with different excitation wavelengths and hence different information depths indicate a tilt of the domain walls with respect to the sample surface. The domain distribution found by Raman spectroscopy is in very good agreement with the finding of electron back scattering diffraction.