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MnO thin films with various thicknesses and strains were grown on MgOsubstrates by pulsed laser deposition, then characterized using x-raydiffraction and infrared reflectance spectroscopy. Films grown on(001)-oriented MgO substrates exhibit homogenous biaxial compressive strainwhich increases as the film thickness is reduced. For that reason, thefrequency of doubly-degenerate phonon increases with the strain, and splitsbelow N\'eel temperature TN due to the magnetic-exchange interaction. Filmsgrown on (110)-oriented MgO substrates exhibit a huge phonon splitting alreadyat room temperature due to the anisotropic in-plane compressive strain. BelowTN, additional phonon is activated in the IR spectra; this trend is evidencefor a spin-order-induced structural phase transition from tetragonal tomonoclinic phase. Total phonon splitting is 55 cm-1 in (110)-oriented MnO film,which is more than twice the value in bulk MnO. This result is evidence thatthe nearest neighbor exchange interaction, which is responsible for themagnetically driven phonon splitting, is greatly increased in compressivelystrained films.

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