Surface phonons of NiO(001) ultrathin films grown pseudomorphically on Ag(001)

Kostov, Konstantin; Polzin, S.; Schumann, Florian; Widdra, W.

doi:10.1016/j.susc.2015.08.022

Cited by 5 publications

(1 citation statement)

References 21 publications

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“…[ 33 ] The traditional experimental techniques used for the SO mode investigations are based on the low‐energy electron and atom scattering phenomena like Helium atom scattering experiments and electron energy loss spectroscopy. [ 34 ] However, Raman spectroscopy is the recent preferable method, due to its high sensitivity and ease of measurement. The weak interaction of photons with the surface layer atoms in Raman spectroscopy can give the information about the SO modes.…”

Section: Resultsmentioning

confidence: 99%

Laser‐induced phonon and magnon properties of NiO nanoparticles: A Raman study

Sunny

2021

J Raman Spectroscopy

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In the present study, the influence of laser intensity on phonon and magnon properties of nickel oxide (NiO) nanoparticles were extensively studied using room temperature Raman spectroscopy. The required NiO nanoparticles were synthesized using a simple sol–gel method. The structural and morphological properties were characterized using powder X‐ray diffraction (XRD), field emission scanning electron microscopy (FE‐SEM), and transmission electron microscopy (TEM) techniques. The rarely reported surface optical (SO) phonon modes of NiO nanoparticles were observed and well‐studied using the dielectric continuum (DC) model. A mismatch between the experimental and DC model SO phonon wavenumbers were observed and is attributed to one magnon‐induced first order phonon shift. The difference between the experimental and DC model SO phonon wavenumbers were reduced with increase in laser power, which indicates the diminishing behavior of magnon excitations. The laser power dependency of highly distinguishable two magnon (2 M) excitation of NiO nanoparticles were well studied. The 2 M modes were experienced a red shift and decrease in intensity with increase in laser power.

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Section: Resultsmentioning

confidence: 99%

Laser‐induced phonon and magnon properties of NiO nanoparticles: A Raman study

Sunny

2021

J Raman Spectroscopy

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Surface Stress and Lattice Dynamics in Oxide Ultrathin Films

Premper

Schumann

Dhaka

et al. 2020

Physica Status Solidi (b)

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The lattice misfit between the substrate and an epitaxial film leads in general to static forces, which define the interface stress, and dynamic responses that modify the thin‐film lattice dynamics. Although these are both fundamental concepts that are important for film growth and thin‐film properties, they have not been investigated in a combined way so far. Therefore, herein, surface stress experiments in combination with surface phonon studies for three different, cubic oxide ultrathin film systems are reviewed. Within the class of binary oxides, NiO(001) grown on Ag(001) is chosen, which exhibits a −2.2% lattice mismatch, and BaO(001) on Pt(001), a system with a negligible lattice mismatch. For the ternary oxides, perovskite thin films of BaTiO3 grown epitaxially on Pt(001) with a lattice mismatch of −2.3% are focused upon. The surface stress experiments are conducted with an optical two‐beam curvature technique under in situ growth conditions. Surface and thin‐film phonons are determined by high‐resolution electron energy loss spectroscopy. Surface stress and lattice dynamics are discussed in the range from the oxide monolayer to thin films of about 20 unit cell in thickness.

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Electron quantum interference in epitaxial antiferromagnetic NiO thin films

Liu

Jia

et al. 2020

AIP Advances

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The electron reflectivity from NiO thin films grown on Ag(001) has been systematically studied as a function of film thickness and electron energy. A strong electron quantum interference effect was observed from the NiO film, which is used to derive the unoccupied band dispersion above the Fermi surface along the Γ−X direction using the phase accumulation model. The experimental bands agree well with first-principles calculations. A weaker electron quantum interference effect was also observed from the CoO film.

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Surface phonons of NiO(001) ultrathin films grown pseudomorphically on Ag(001)

Cited by 5 publications

References 21 publications

Laser‐induced phonon and magnon properties of NiO nanoparticles: A Raman study

Laser‐induced phonon and magnon properties of NiO nanoparticles: A Raman study

Surface Stress and Lattice Dynamics in Oxide Ultrathin Films

Electron quantum interference in epitaxial antiferromagnetic NiO thin films

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