Autor: |
Hao Tang, Nathalie Tarrat, Véronique Langlais, Yongfeng Wang |
Jazyk: |
angličtina |
Rok vydání: |
2017 |
Předmět: |
|
Zdroj: |
Beilstein Journal of Nanotechnology, Vol 8, Iss 1, Pp 2484-2491 (2017) |
Druh dokumentu: |
article |
ISSN: |
2190-4286 |
DOI: |
10.3762/bjnano.8.248 |
Popis: |
The adsorption of the iron tetraphenylporphyrin (FeTPP) molecule in its deckchair conformation was investigated on Au(111), Ag(111) and Cu(111) surfaces by performing spin-polarized density functional theory (DFT) calculations taking into account both van der Waals (vdW) interaction and on-site Coulomb repulsion. The deckchair conformation of the molecule favours intermolecular π–π-type interactions in a less densely packed monolayer than the saddle conformation. The activation barrier between the two stable magnetic states (high spin, S = 2 and intermediate spin, S = 1) of the molecule in vacuum disappears upon adsorption on the metal surfaces. The high-spin state of physisorbed FeTPP is stable on all adsorption sites. This result reveals that an external permanent element such as a STM tip or an additional molecule is needed to use FeTPP or similar molecules as model system for molecular spin switches. |
Databáze: |
Directory of Open Access Journals |
Externí odkaz: |
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