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

doi:10.1088/1674-1056/ab9615

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 T_2g 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
Accepted manuscript online:

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

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