Enhancement of the spin polarization of an Fe3O4(100) surface by nitric oxide adsorption
| Autor: | Bing Wang, M. Jibran, Andrew Pratt, Yasushi Yamauchi, Xia Sun, Zijing Ding, Zhiang Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Spin polarization Fermi level General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Bond length Condensed Matter::Materials Science symbols.namesake Magnetization Adsorption 0103 physical sciences Atom Physics::Atomic and Molecular Clusters symbols Molecule Density functional theory Physics::Chemical Physics Physical and Theoretical Chemistry 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Chemistry Chemical Physics. 20:15871-15875 |
| ISSN: | 1463-9084 1463-9076 |
| Popis: | The geometric, electronic and magnetic properties of a nitric oxide (NO) adsorbed Fe3O4(100) surface have been investigated using density functional theory (DFT) calculations. NO molecules preferentially bond with surface Fe(B) atoms via their N atoms. The generalized gradient approximation (GGA) is not recommended to be used in such a strongly correlated system since it provides not only an overestimation of the adsorption energy and an underestimation of the Fe(B)–N bond length, but also magnetic quenching of the adsorbate and the bonded Fe(B) atoms. In contrast, a tilted geometry and magnetization of the adsorbate and the bonded Fe(B) atom are obtained after including the strong on-site Coulomb interactions through a Hubbard term (GGA+U). The spin-down 2π* states of the NO molecule are filled and broadened due to the adsorbate–substrate interaction and the molecule–molecule interaction. The surface spin polarization close to the Fermi level is expected to be greatly enhanced by the NO adsorption which has significance for interface design in spintronic devices. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|