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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.91: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Spin-polarized scanning tunneling microscopy applied to nanoscale Fe islands — •Dinesh Subramaniam, Marco Pratzer, and Markus Morgenstern — II. Institute of Physics B, RWTH Aachen, 52056 Aachen
The magnetic properties of single-crystal nanoscale Fe islands on W(110) have been studied by spin-polarized scanning tunnelling microscopy. All measurements have been done at room temperature by a modified commercial Omicron “AFM/STM” using a 5 monolayer iron covered tungsten tip with an in-plane magnetic sensitivity. Preparation has been done by molecular beam epitaxy in UHV. We investigated islands with lateral dimensions of 200 by 400 nm2 and different heights from 3 to 8 nm. The observed domain structures are in line with previous results [1] and with theoretical analysis. Variation of the thickness leads to different magnetic domain structures of the islands, which are dominated by the surface anisotropy with an easy axis along the [1 1 0] direction [1,2]. For islands with a thickness of 3.5 nm, the uniaxial surface anisotropy of Fe/W(110) leads to a single domain state. For thicker islands the magnetostatic energy becomes dominant due to the reduced anisotropy energy. This results in a multi domain configuration.
[1] M. Bode, A. Wachowiak, J. Wiebe, A. Kubetzka, M. Morgenstern, R. Wiesendanger, Appl. Phys. Lett. 84 (2004) 948.
[2] A.Wachowiak, J. Wiebe, M. Bode, O. Pietzsch, M. Morgenstern, R. Wiesendanger, Science 298 (2002) 577.