Spin-phonon interaction increased by compressive strain in antiferromagnetic MnO thin films

0531760 - FZÚ 2021 RIV GB eng J - Článek v odborném periodiku
Kashir, A. - Goian, Veronica - Pacherová, Oliva - Savinov, Maxim - Jeong, Y.H. - Lee, G.H. - Kamba, Stanislav
Spin-phonon interaction increased by compressive strain in antiferromagnetic MnO thin films.
Journal of Physics-Condensed Matter. Roč. 32, č. 17 (2020), s. 1-8, č. článku 175402. ISSN 0953-8984. E-ISSN 1361-648X
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; GA ČR GA18-09265S
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: exchange coupling * phonons * infrared spectroscopy * thin films
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.333, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1088/1361-648X/ab6be9

MnO thin films with various thicknesses and strains were grown on MgO substrates by pulsed laser deposition technique. Films grown on (001)-oriented MgO substrates exhibit homogenous biaxial compressive strain which increases as the film thickness is reduced. For that reason, in paramagnetic phase,the frequency of doubly-degenerate phonon increases with the strain, and splits below Néel temperature TN due to the magnetic-exchange interaction. The phonon splitting in the MnO (001) films is 20% larger than that of the bulk MnO. Total phonon splitting is 55 cm-1 in (110)-oriented MnO film, which is more than twice the value in bulk MnO, but since the splitting is present already in paramagnetic phase, we cannot clearly correlate it with the value of exchange coupling constant.
Trvalý link: http://hdl.handle.net/11104/0310373