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O: Oberflächenphysik

O 19: Electronic structure II

O 19.6: Talk

Tuesday, March 28, 2006, 12:30–12:45, WIL A317

Image states on ferromagnetic surfaces explored by tunneling spectroscopy — •Andre Kubetzka, Matthias Bode, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany

Above metal surfaces a series of hydrogenlike states can exist in the potential well created by the attractive image potential and the surface projected bulk band gap, which hinders a decay into the crystal, with energies between the Fermi and the vacuum level. These so-called image or image-potential states have been investigated in the past by inverse photoemission (IPE) and tunneling spectroscopy [1].

In ferromagnets the band gap is spin dependent which results in a small spin-splitting of these states. The first experimental investigation with spin-resolved IPE determined a value of 18 meV for Ni(111) [2]. We will present first results for image states on Fe(110), employing low temperature spin-polarized scanning tunneling spectroscopy.

[1] G. Binnig et al., Phys. Rev. Lett. 55, 991 (1985)

[2] F. Passek and M. Donath, Phys. Rev. Lett. 69, 1101 (1992)