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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.65: Poster

Dienstag, 26. Februar 2008, 15:15–18:30, Poster E

Observation of a spin spiral state in the Mn monolayer on W(001) — Kirsten von Bergmann, Paolo Ferriani, Elena Vedmedenko, •André Kubetzka, Stefan Heinze, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Germany

The magnetism of single atomic layers is a fascinating topic. Due to the reduced symmetry, changed nearest neighbor distances, and hybridization with the substrate the magnetic properties can be quite distinct from the respective bulk systems. A variety of magnetic structures can be observed, ranging from collinear ferro- or antiferromagnetic states to complex non-collinear spin structures. Spin-polarized scanning tunneling microscopy (SP-STM) combines magnetic sensitivity with high lateral resolution and therefore grants access to such complex magnetic order with unit cells on the nanometer scale. Recently, different intricate magnetic structures have been observed in pseudomorphic 3d atomic layers on 5d transition metal substrates [1,2].

Here we present SP-STM data of the pseudomorphic Mn layer on W(001). We observe a spin spiral with a periodicity on the nanometer-scale. Due to the four-fold symmetry of the surface, two rotational domains are possible. Via spin-orbit interaction the spin-spiral and the rotational domains can also be imaged with non-magnetic probe tips [3].

[1] K. von Bergmann et al., Phys. Rev. Lett. 96, 167203 (2006).

[2] M. Bode et al., Nature 447, 190 (2007).

[3] M. Bode et al., Phys. Rev. Lett. 89, 237205 (2002).