| AVS 64th International Symposium & Exhibition | |
| Magnetic Interfaces and Nanostructures Division | Wednesday Sessions |
| Session MI+SA-WeM |
| Session: | Controlling Magnetism in Oxides and Multiferroics and Chirality in Spin Transport and Magnetism (cont.) |
| Presenter: | Matthias Kettner, University of Münster, Germany |
| Authors: | M. Kettner, University of Münster, Germany D. Nürenberg, University of Münster, Germany J. Seibel, Empa, Swiss Federal Laboratories for Materials Science and Technology, Switzerland H. Zacharias, University of Münster, Germany K.-H. Ernst, Empa, Swiss Federal Laboratories for Materials Science and Technology, Switzerland |
| Correspondent: | Click to Email |
The interaction of electrons with helical molecules attains growing interest due to a spin selectivity in electron transmission. Experiments on self-assembled monolayers of double stranded DNA [1] and oligopeptides [2,3] indicated a very efficient spin filtering behavior of the molecules at room temperature.
In present experiments enantiopure M- and P-heptahelicene molecules are evaporated onto different metal single crystal surfaces. The molecules arrange themselves to a highly ordered monolayer [4,5]. Samples are then irradiated with λ = 213nm laser radiation to generate photoelectrons from the substrate. These electrons are transmitted through the heptahelicene layer and analyzed with regard to their average longitudinal spin orientation by Mott scattering. The sign of the spin polarization depends on the helicity of the enantiomer. The effect of the heptahelicene on the spin orientation seems to be independent on the substrate.
References
[1] Göhler, B.; Hamelbeck, V.; Markus, T. Z.; Kettner, M.; Hanne, G. F.; Vager, Z.; Naaman, R.; Zacharias, H., Science 2011, 331, 894.
[2] Ray, K.; Ananthavel, S. P.; Waldeck, D. H.; Naaman, R. Science 1999, 283, 814.
[3] Kettner, M.; Göhler, B.; Zacharias, H.; Mishra, D.; Kiran, V.; Naaman, R.; Fontanesi, C.; Waldeck, D. H.; Sęk, S.; Pawłowski, J.; Juhaniewicz, J. J.Phys.Chem. C 2014, 119, 26.
[4] Fasel, R.; Cossy, A.; Ernst, K.-H.; Baumberger, F.; Greber, T.; Osterwalder, J. J. Chem. Phys. 2001, 115, 2.
[5] Seibel, J.; Parschau, M.; Ernst, K.-H., J.Phys.Chem. C 2014, 118, 29135