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

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    0531760 - FZÚ 2021 RIV GB eng J - Journal Article
    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
    R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR GA18-09265S
    Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
    Institutional support: RVO:68378271
    Keywords : exchange coupling * phonons * infrared spectroscopy * thin films
    OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
    Impact factor: 2.333, year: 2020
    Method of publishing: Limited access
    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.
    Permanent Link: http://hdl.handle.net/11104/0310373

     
     
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