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

Yang Yang; Qiang Zhang; Wenbo Mi; Xixiang Zhang

doi:10.1088/1674-1056/ab9615

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

Yang Yang, Qiang Zhang, Wenbo Mi, Xixiang Zhang

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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 film with decreased 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.

Original language	English (US)
Journal	Chinese Physics B
DOIs	https://doi.org/10.1088/1674-1056/ab9615
State	Published - May 25 2020

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10.1088/1674-1056/ab9615

https://repository.kaust.edu.sa/bitstream/10754/662994/1/Lettice%20deformation_Yang%2bet%2bal_2020_Chinese_Phys._B_10.1088_1674-1056_ab9615.pdf

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@article{4244dda337634719ae8e570b7599c622,

title = "Lattice deformation in epitaxial Fe3O4 films on MgO substrate studied by polarized Raman spectroscopy∗",

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 film with decreased 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.",

author = "Yang Yang and Qiang Zhang and Wenbo Mi and Xixiang Zhang",

note = "KAUST Repository Item: Exported on 2020-10-01",

year = "2020",

month = may,

day = "25",

doi = "10.1088/1674-1056/ab9615",

language = "English (US)",

journal = "Chinese Physics B",

issn = "1674-1056",

publisher = "IOP Publishing",

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TY - JOUR

T1 - Lattice deformation in epitaxial Fe3O4 films on MgO substrate studied by polarized Raman spectroscopy∗

AU - Yang, Yang

AU - Zhang, Qiang

AU - Mi, Wenbo

AU - Zhang, Xixiang

N1 - KAUST Repository Item: Exported on 2020-10-01

PY - 2020/5/25

Y1 - 2020/5/25

N2 - 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 film with decreased 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.

AB - 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 film with decreased 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.

UR - http://hdl.handle.net/10754/662994

UR - https://iopscience.iop.org/article/10.1088/1674-1056/ab9615

U2 - 10.1088/1674-1056/ab9615

DO - 10.1088/1674-1056/ab9615

M3 - Article

SN - 1674-1056

JO - Chinese Physics B

JF - Chinese Physics B

ER -

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

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