Magnon and Phonon Excitations in Nanosized NiO
Latvian Journal of Physics and Technical Sciences 2019
Jānis Grabis, Ņina Mironova-Ulmane, A Kuzmin, I Sildos, Laurits Puust

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.

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

Grabis, J., Mironova-Ulmane, Ņ., Kuzmin, A., Sildos, I., Puust, L. Magnon and Phonon Excitations in Nanosized NiO. Latvian Journal of Physics and Technical Sciences, 2019, Vol. 56, No. 2, pp.61-72. ISSN 0868-8257. Available from: doi:10.2478/lpts-2019-0014

Publication language
English (en)
The Scientific Library of the Riga Technical University.
E-mail:; Phone: +371 28399196