Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 2: Magnetic Thin Films I

MA 2.4: Vortrag

Montag, 27. März 2006, 11:00–11:15, HSZ 03

Spin-Polarized Scanning Tunneling Spectroscopy of Dislocation Lines in Fe Films on W(110) — •Oswald Pietzsch, Matthias Bode, Kirsten von Bergmann, André Kubetzka, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg

The magnetic properties of 1 - 2 atomic layers Fe on W(110) have recently been studied in many aspects by spin-polarized scanning tunneling microscopy (SP-STM) and spectroscopy (SP-STS). Here we use the high lateral and energy resolution of this method to address the structural, electronic, and magnetic properties of dislocation lines which occur before completion of the second layer, thereby releasing tensile strain arising from a 9.4 % lattice mismatch. The lines are found to be ferromagnetically ordered. The magnetic contrasts are related to the film’s perpendicular domain configuration, but the electronic features are quite unique. In particular, from the well-known two-peak structure of the Fe film, the occupied LDOS-peak is recovered in the dislocation line while the unoccupied peak is strongly shifted towards the Fermi level. As a consequence, the bias-voltage dependent magnetic asymmetry as determined from tunneling spectra is significantly altered in these lines.