Correlation between tetragonal zinc-blende structure and magnetocrystalline anisotropy of MnGa epilayers on GaAs(111)
| Autor: | Zacarias Eduardo Fabrim, J. Varalda, J. Zarpellon, H. F. Jurca, A. W. Arins, Wido H. Schreiner, Paulo Fernando Papaleo Fichtner, D. H. Mosca |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Magnetic moment Condensed matter physics Electronic structure Condensed Matter Physics Magnetocrystalline anisotropy Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Magnetization Tetragonal crystal system Ferrimagnetism Condensed Matter::Superconductivity Density functional theory Anisotropy |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 381:83-88 |
| ISSN: | 0304-8853 |
| Popis: | MnGa films of few nanometer thickness with tetragonal zinc-blende (TZB) structure were grown by molecular beam epitaxy on GaAs(111) substrates. These ultrathin films have high magnetization at room temperature with magnetic moment as high as 3.2 μ B per formula unit. A strong magnetocrystalline anisotropy energy (MAE) comparable to that reported to δ -MnGa films with body-centered tetragonal (BCT) structure with similar c / a =1.1 is observed. Electronic structure calculations using density functional theory (DFT) reveal a robust ferrimagnetic ground state at room temperature and confirm that zinc-blende structure with tetragonal distortion has a metastable character. The strong MAE is associated with anisotropy of orbital magnetic moment which is described by the symmetry of the spin-polarized charge density along the crystallographic axes. |
| Databáze: | OpenAIRE |
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