<abstract xmlns="http://www.w3.org/1999/xhtml">Single-crystal, microcrystalline and nanocrystalline nickel oxides (NiO) have been studied by Raman spectroscopy. A new band at ~200 cm−1 and TO-LO splitting of the band at 350–650 cm−1 have been found in the spectra of single-crystals NiO(100), NiO(110) and NiO(111). The Raman spectra of microcrystalline (1500 nm) and nanocrystalline (13–100 nm) NiO resemble those of the single crystals. They all contain the two-magnon band at 1500 cm−1, indicating that the oxides remain at room temperature in the antiferromagnetic phase. Besides, a new sharp Raman band has been observed at 500 cm−1 in nanocrystalline NiO. Its temperature dependence suggests the magnetic origin of the band, possibly associated with the one-phonon–one-magnon excitation at the Brillouin zone centre.</abstract>

Single-crystal, microcrystalline and nanocrystalline nickel oxides (NiO) have been studied by Raman spectroscopy. A new band at ~200 cm−1 and TO-LO splitting of the band at 350–650 cm−1 have been found in the spectra of single-crystals NiO(100), NiO(110) and NiO(111). The Raman spectra of microcrystalline (1500 nm) and nanocrystalline (13–100 nm) NiO resemble those of the single crystals. They all contain the two-magnon band at 1500 cm−1, indicating that the oxides remain at room temperature in the antiferromagnetic phase. Besides, a new sharp Raman band has been observed at 500 cm−1 in nanocrystalline NiO. Its temperature dependence suggests the magnetic origin of the band, possibly associated with the one-phonon–one-magnon excitation at the Brillouin zone centre.

Magnon and Phonon Excitations in Nanosized NiO

Latvian Journal of Physics and Technical Sciences

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Magnon and Phonon Excitations in Nanosized NiO"}

Single-crystal, microcrystalline and nanocrystalline nickel oxides (NiO) have been studied by Raman spectroscopy. A new band at ~200 cm−1 and TO-LO splitting...

Magnon and Phonon Excitations in Nanosized NiO

Publié en ligne: 22 mai 2019

Pages: 61 - 72

DOI: https://doi.org/10.2478/lpts-2019-0014

Mots clés
lattice dynamics, magnons, nickel oxide, nanoparticles, Raman spectroscopy

© 2019 N. Mironova-Ulmane et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Magnon and Phonon Excitations in Nanosized NiO

Publié en ligne: 22 mai 2019

Pages: 61 - 72

DOI: https://doi.org/10.2478/lpts-2019-0014

Mots cléslattice dynamics, magnons, nickel oxide, nanoparticles, Raman spectroscopy

© 2019 N. Mironova-Ulmane et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Mots clés
lattice dynamics, magnons, nickel oxide, nanoparticles, Raman spectroscopy