Regensburg 2004 – scientific programme
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MA: Magnetismus
MA 31: Spinelektronik
MA 31.2: Talk
Friday, March 12, 2004, 11:00–11:15, H22
Utilizing the Rashba-effect at metal surfaces — •O. Krupin1, G. Bihlmayer2, S. Gorovikov3, J. E. Prieto1, K. Döbrich1, G. Kaindl1, S. Blügel2, and K. Starke1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Germany — 2Institut für Festkörperforschung (IFF), Forschungszentrum Jülich — 3MAX-Lab, Lund University, Sweden
Traditionally, semiconductor-heterostructures are considered as a base for spintronic devices where the Rashba effect is exploited. An important step for practical use, e.g. in coherent spin rotators and spin interference devices, is to find structures that allow manipulation of electron spin without an external magnetic field. Because of the large resistivity mismatch at the ferromagnet/semiconductor interface, experiments based on the idea to inject spin-polarised electrons from ferromagnetic metals have so far shown only limited success. The Rashba effect, however, is much more general and probably metals can be used as Rashba active media. Surface states on closed packed surfaces of noble and rare earth metals reveal a significant spin-orbit splitting. In addition, they also represent a quasi two-dimensional electronic system in which the Rashba interaction can be modified by adsorption. We characterize some of these surfaces and discuss possible advantages and drawbacks of these systems.