Temperature dependence of Mn1.56Co0.96Ni0.48O4 thin films optical properties by spectroscopic ellipsometry

The optical properties of spinel Mn1.56Co0.96Ni0.48O4 thin films have been investigated by spectroscopic ellipsometry in the temperature range from 20 to 260°C. By fitting the measured ellipsometric parameter data with a three-layer model by Tauc–Lorentz oscillator dispersion formula, the refractive...

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Bibliographic Details
Published in:Materials letters 2014-12, Vol.136, p.225-228
Main Authors: Ma, Chao, Wang, Hong Guang, Zhao, Peng Jun, Xu, Jin Bao, Chang, Ai Min, Wang, Lei, Bian, Liang
Format: Article
Language:English
Subjects:
Ellipsometry
Extinction
Mathematical models
Mechanism
Optical properties
Refractive index
Refractivity
Spectroscopic ellipsometry
Spectroscopy
Temperature dependence
Thin films
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Summary:The optical properties of spinel Mn1.56Co0.96Ni0.48O4 thin films have been investigated by spectroscopic ellipsometry in the temperature range from 20 to 260°C. By fitting the measured ellipsometric parameter data with a three-layer model by Tauc–Lorentz oscillator dispersion formula, the refractive index and extinction coefficient of the thin films are determined in the spectral range of 280–850nm. The refractive index decreases in the short-wavelength region but increases in the long-wavelength region with increasing temperature. The extinction coefficient increases with increasing temperature in all visible region. •Optical properties under different temperature conditions are firstly reported.•Three-phase model was built to fit ellipsometry parameters by TL dispersion function.•The mechanism in variations of n and k has been investigated.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2014.08.025