Ab initio and nuclear inelastic scattering studies of Fe3Si/GaAs heterostructures
| Autor: | Hans-Christian Wille, Przemysław Piekarz, I. Sergueev, Małgorzata Sternik, Jens Herfort, Svetoslav Stankov, Paweł T. Jochym, Krzysztof Parlinski, Tilo Baumbach, Andrzej Ptok, J. Kalt, Olga Sikora, Bernd Jenichen, J. Łażewski |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Magnetic moment Condensed matter physics Spin polarization Phonon Ab initio Charge density 02 engineering and technology Inelastic scattering 021001 nanoscience & nanotechnology 01 natural sciences Magnetization 0103 physical sciences Density functional theory 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 99 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.99.134303 |
| Popis: | The structure and dynamical properties of the ${\mathrm{Fe}}_{3}\mathrm{Si}/\mathrm{GaAs}(001)$ interface are investigated by density functional theory and nuclear inelastic scattering measurements. The stability of four different atomic configurations of the ${\mathrm{Fe}}_{3}\mathrm{Si}/\mathrm{GaAs}$ multilayers is analyzed by calculating the formation energies and phonon dispersion curves. The differences in charge density, magnetization, and electronic density of states between the configurations are examined. Our calculations unveil that magnetic moments of the Fe atoms tend to align in a plane parallel to the interface, along the [110] direction of the ${\mathrm{Fe}}_{3}\mathrm{Si}$ crystallographic unit cell. In some configurations, the spin polarization of interface layers is larger than that of bulk ${\mathrm{Fe}}_{3}\mathrm{Si}$. The effect of the interface on element-specific and layer-resolved phonon density of states is discussed. The Fe-partial phonon density of states measured for the ${\mathrm{Fe}}_{3}\mathrm{Si}$ layer thickness of three monolayers is compared with theoretical results obtained for each interface atomic configuration. The best agreement is found for one of the configurations with a mixed Fe-Si interface layer, which reproduces the anomalous enhancement of the phonon density of states below 10 meV. |
| Databáze: | OpenAIRE |
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