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MA: Fachverband Magnetismus
MA 10: Magnetic Imaging
MA 10.7: Talk
Monday, March 23, 2009, 18:45–19:00, HSZ 403
Imaging single atom spins on a magnetic template — •Andre Kubetzka1, Paolo Ferriani1, David Serrate1, Yasuo Yoshida1, Saw-Wai Hla2, Matthias Menzel1, Oliver Ferdinand1, Kirsten von Bergmann1, Stefan Heinze1, and Roland Wiesendanger1 — 1Institute of Applied Physics, University of Hamburg, Hamburg, Germany — 2Department of Physics and Astronomy, Ohio University, USA
In the past, magnetic adatoms have been investigated intensively by scanning tunneling spectroscopy on non-magnetic metal surfaces. In these systems the adatom spin is not stable in time, and a Kondo-state may form due to scattering of conduction electrons. It has been shown that the magnetic moments can be stabilized either by external fields [1] or by exchange coupling to a ferromagnetic surface [2], thereby becoming accessible to spin-resolved measurements (SP-STM). In this work we have investigated Co adatoms on a versatile magnetic template at T=10 K. Surprisingly, in addition to an apparent height contrast, the appearance of the atoms in constant current and spectroscopy images depends on their spin orientation. We will discuss details of the contrast mechanism and the electronic states involved.
[1] F. Meier et al., Science 320, 82 (2008).
[2] Y. Yayon et al., Phys. Rev. Lett. 99, 67202 (2007).