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Chin. Phys. B, 2020, Vol. 29(8): 083302    DOI: 10.1088/1674-1056/ab9615
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Lattice deformation in epitaxial Fe3O4 films on MgO substrates studied by polarized Raman spectroscopy

Yang Yang(杨洋)1, Qiang Zhang(张强)2, Wenbo Mi(米文博)3, Xixiang Zhang(张西祥)2
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 PSE Division, King Abdullah University of Science and Technology(KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia;
3 Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, School of Science, Tianjin University, Tianjin 300354, China
Abstract  

The lattice structures of epitaxial Fe3O4 films deposited on MgO were studied systematically using polarized Raman spectroscopy as a function of film thickness, where interesting phenomena were observed. Firstly, the spectral conflict to the Raman selection rules (RSRs) was observed under cross-sectional configuration, which can be attributed to the tetragonal deformation in the growth direction due to the lattice mismatch between Fe3O4 and MgO. Secondly, the blue shift and broadening of Raman peaks evidenced the decrease of the tensile strain in Fe3O4 films with decreasing thickness. Thirdly, distinct from the other Raman modes, the lowest T2g mode exhibited asymmetric lineshape, which can be interpreted using the spatial correlation model. The increased correlation length introduced in the model can well explain the enhanced peak asymmetry feature with decreasing thickness. These results provide useful information for understanding the lattice structure of epitaxial Fe3O4 film.

Keywords:  polarized Raman scattering      Fe3O4 film      tetragonal deformation      spatial correlation model  
Received:  02 April 2020      Revised:  12 May 2020      Published:  05 August 2020
PACS:  33.20.Fb (Raman and Rayleigh spectra (including optical scattering) ?)  
  68.55.-a (Thin film structure and morphology)  
  74.62.Dh (Effects of crystal defects, doping and substitution)  
Fund: 

Project supported by the National Key Research and Development Program of China (Grant No. 2018YFB0703500) and the National Natural Science Foundation of China (Grant No. 11704401).

Corresponding Authors:  Yang Yang     E-mail:  yang.yang@iphy.ac.cn

Cite this article: 

Yang Yang(杨洋), Qiang Zhang(张强), Wenbo Mi(米文博), Xixiang Zhang(张西祥) Lattice deformation in epitaxial Fe3O4 films on MgO substrates studied by polarized Raman spectroscopy 2020 Chin. Phys. B 29 083302

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