Positron States at Li- and O-adsorbed Fe(001) Ferromagnetic Surfaces Studied by Two-Component Density Functional Theory
| Autor: | Kazuyuki Watanabe, Satoshi Hagiwara |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Surface (mathematics) Astrophysics::High Energy Astrophysical Phenomena Binding energy General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Positron annihilation spectroscopy Dipole Positron Adsorption Ferromagnetism 0103 physical sciences Physics::Accelerator Physics High Energy Physics::Experiment Density functional theory Atomic physics 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of the Physical Society of Japan. 85:114703 |
| ISSN: | 1347-4073 0031-9015 |
| Popis: | The positron states for Li- and O-adsorbed Fe(001) ferromagnetic surfaces are studied by using two-component density functional theory. Positron surface lifetimes and positron binding energies are found to be sensitive to changes in the surface structure and the dipole barrier induced by adatoms, which can be understood by the positron density distribution and surface potential. Spin-dependent positron lifetime fractions are in excellent agreement with spin-polarization fractions at the topmost surface, because the localized positrons at the surface are sensitive to the surface magnetic state. Therefore, the present results show that spin-polarized positron annihilation spectroscopy can extract the outermost surface magnetic state. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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