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Raman studies of cation distribution and thermal stability of epitaxial spinel NiCo2O4 films
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Image of FIG. 1.
FIG. 1.

The HR-XRD spectrum around the (004) reflections of the MAO substrate and the NCO film.

Image of FIG. 2.
FIG. 2.

Bright field images from NCO250, NCO350, and NCO550 films with (a)–(c) and (d)–(e) diffracting vectors, respectively. Note the different appearance of the contrast pattern, in particular, for the NCO550 film. All the films are single crystalline.

Image of FIG. 3.
FIG. 3.

Polarized Raman spectra of NCO/MAO films grown at , 350, 450, 500, 525, and 550 °C, obtained at room temperature with 488 nm excitation.

Image of FIG. 4.
FIG. 4.

Variations of the mode frequencies of NCO/MAO films with substrate temperature during deposition.

Image of FIG. 5.
FIG. 5.

Temperature-dependent Raman spectra of the NCO250 between 23 and 600 °C. The spectra, taken at 23 °C after the annealing, are practically identical to those measured at the same temperature before the annealing. The peak marked with a star comes from the MAO substrate

Image of FIG. 6.
FIG. 6.

Polarized Raman spectra of NCO250 (left column) and NCO550 (right column) before annealing (first row), after annealing at 600 °C for 2 h in oxygen (second row), and after annealing at 600 °C for 2 h in vacuum (third row).

Image of FIG. 7.
FIG. 7.

XX and XY spectra of NCO550 (upper panel) and NCO250 (bottom panel) obtained with 515 nm excitation at 294 K and 80 K.


Generic image for table
Table I.

Structural and magnetic properties of NCO/MAO films used in this study.

Generic image for table
Table II.

Polarization selection rules for backward Raman scattering from (001) surface of spinel structure.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Raman studies of cation distribution and thermal stability of epitaxial spinel NiCo2O4 films