Berlin 2005 – scientific programme

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O: Oberflächenphysik

O 13: Magnetismus

O 13.1: Talk

Friday, March 4, 2005, 15:45–16:00, TU EB107

Nanomagnet arrays fabricated on self-organized semiconductor templates — •C. Teichert¹, A.M. Mulders², M.A. Niño³, S. Heun⁴, A. Locatelli⁴, C. Hofer¹, N. Mikuszeit³, J. Camarero³, A. Fraile Rodriguez², J.J. de Miguel³, and R. Miranda³ — ¹Inst. of Physics, University of Leoben, A-8700 Leoben, Austria — ²Dept. of Physics, Uppsala University, S-75121 Uppsala Sweden — ³Dept. of Condensed Matter Physics and Institute of Materials Science N. Cabrera Univ. Autónoma de Madrid, Cantoblanco, 28049-Madrid, Spain — ⁴Sincrotrone Trieste, in AREA Science Park, 34012 Basovizza, Trieste, Italy

Self-organized nanofaceted semiconductor surfaces are attractive candidates to be used as large-area templates for the growth of magnetic nanostructures. By shadow deposition onto selected facet types, arrays of isolated nanomagnets can be fabricated. Using this technique we prepared Co nanomagnets on SiGe templates at the Nanospectroscopy Beamline of the synchrotron ELETTRA. X-ray magnetic circular dichroism (XMCD) measurements using a photoemission electron microscope reveal the in plane magnetization of the 7 monolayer thick Co nanomagnets. Their base size of about 200 nm x 25 nm corresponds to the facet size of the templates as determined by atomic-force microscopy. Although the nanomagnets are isolated, XMCD reveals several micrometer large areas within which the nanomagnets have correlated magnetization. The magnetic coupling is preferentially along the easy axis of the nanomagnets in agreement with micromagnetic simulations.