Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 8: Hauptvortrag Bode

O 8.1: Hauptvortrag

Montag, 8. März 2004, 14:45–15:30, H36

Spin-polarized scanning tunneling microscopy: From nanomagnetism to the spin-resolved bandstructure — •M. Bode1, K. von Bergmann1, A. Kubetzka1, O. Pietzsch1, R. Wiesendanger1, M. Heide2, and S. Blügel21Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg — 2Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich

In recent years spin-polarized scanning tunneling microscopy (SP-STM) has been developed to become a powerful method with a focus on high-resolution imaging of domain structures of (anti)ferromagnetic surfaces and nanostructures [1]. This traditional field of application will be exemplified by data measured on ferro- and superparamagnetic Fe islands.

Furthermore, scanning tunneling spectroscopy (STS) allows the imaging of the spatial distribution of the electronic density of states close to the Fermi level. Wherever the translational invariance of the surface is disturbed, the superposition of incoming and reflected electron wave functions leads to interference patterns, which contains information about the life time and the dispersion relation of the electronic states involved [2]. Experiments performed with magnetic probe tips on a magnetic surface show a striking dependence of the intensity of the interference pattern on the relative magnetic orientation of tip and sample. This allows the direct identification of the spin-character of the electronic states involved in the scattering process.

[1] M. Bode, Rep. Prog. Phys. 66, 523 (2003)

[2] J. Kliewer, R. Berndt, and S. Crampin, New J. Phys. 3, 22 (2001)

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