Regensburg 2004 – scientific programme

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MA: Magnetismus

MA 4: Oberfl
ächenmagnetismus

MA 4.8: Talk

Monday, March 8, 2004, 12:00–12:15, H22

Magnetism of Fe on W(001) — •Kirsten von Bergmann, Matthias Bode, and Roland Wiesendanger — University of Hamburg, Institute of Applied Physics, Jungiusstr. 11, 20355 Hamburg, Germany

There has been a lot of interest in the magnetic properties of the highly strained pseudomorphic layers of Fe on W(001). Using spatially averaging methods contrary results have been reported concerning the anisotropy axis [1-3]. To overcome this discrepancy we used spin-polarized scanning tunneling microscopy (SP-STM) to investigate this system: the method is magnetically sensitive and has a high spatial resolution which allows not only the investigation of magnetic properties but also a direct correlation to electronic structure measurements and detailed topographic studies.

The domain structure of Fe on W(001) in the low coverage regime is imaged and the four fold anisotropy can directly be deduced from maps of differential conductance (dI/dU). Quantitative analysis of the intensity of the dI/dU signal reveals a layer-dependent anisotropy axis in the pseudomorphic regime: the magnetic easy axis rotates by 45^∘ from ⟨ 110 ⟩ in layers with a local coverage of 2 and 3 ML to ⟨ 100 ⟩ at a local coverage of 4 ML.

[1] G. A. Mulhollan et al., Phys. Rev. B 43, 13645 (1991).

[2] T. L. Jones and D. Venus, Surf. Sci. 302, 126 (1994).

[3] W. Wulfhekel et al., Europhys. Lett. 49, 651 (2000).