Abstract
Mn1.56Co0.96Ni0.48O4 (MCN) thin films are deposited onto Si (100) substrate under different post-annealing temperatures of 450 °C and 600 °C. As identified by the X-ray diffraction (XRD) and SEM, pronounced difference in crystallinity is observed between the film annealed under 600 °C and 450 °C. Spectroscopic ellipsometry spectra, infrared transmission and reflection spectra are measured to compare and analyze the optical properties of the crystalline and non-crystalline MCN thin films. Ellipsometry measurement demonstrates the n, k spectra in the visible-to-near infrared range (300–1000 nm), indicating three absorption peaks locating at 1.6 eV, 2.6 eV, and above 3.5 eV for the crystallized sample, which corresponds to the charge-transfer (CT) transition involving O2− (2p) and Mn4+ (3d) ions, O2− (2p) to Co2+ (3d) ions, and O2− (2p) and Mn3+ (3d) ions, respectively. Transmittance and reflectance spectra in the near infrared (1.3 µm)-to-far infrared (25 µm) range are also investigated. A two-oscillator model is performed to directly analyze the combined transmission and reflection spectra in the far infrared (400 cm−1–800 cm−1) to acquire the optical constants, where the difference of n, k values of the crystallized and non-crystalline MCN films in reststrahlen band is investigated for the first time.
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Acknowledgements
This work was supported by Innovation Shanghai Institute of Technical Physics, CX-197; National Science Fund (NSF) for Youth of China, Grant No. 61604160; NSF for Distinguished Youth Scholars, Grant No. 61625505.
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Zhou, W., Wu, C.Y., Yin, Y.M. et al. Crystallization-dependent structural and optical properties of Mn1.56Co0.96Ni0.48O4 thin films grown by chemical solution deposition on Si (100). Appl. Phys. A 125, 64 (2019). https://doi.org/10.1007/s00339-018-2242-9
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DOI: https://doi.org/10.1007/s00339-018-2242-9