Regensburg 2007 – wissenschaftliches Programm

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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 15.84: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Structural properties of magnetic Fe₅₀Co₅₀ alloy Clusters — •Furkan Bulut¹, R. Kerstin Gebhardt¹, Daniela Sudfeld², Joachim Bansmann³, Armin Kleibert⁴, and Mathias Getzlaff¹ — ¹Institut für Angewandte Physik, Universität Düsseldorf — ²Fachbereich Physik, Universität Duisburg-Essen — ³Insitut für Oberflächenchemie und Katalyse, Universität Ulm — ⁴Institut für Physik, Universität Rostock

Fe₅₀Co₅₀ alloy clusters were produced by a continuously working arc cluster ion source (ACIS) and subsequently mass-filtered by means of an electrostatic quadrupol. Their diameter is in the range between 6 and 12nm. We discuss the structural properties of such alloy clusters by means of high resolution transmission electron microscopy (HR-TEM). The alloy clusters were deposited on a W(110) surface under UHV condition. The structural properties of supported clusters were determined by in-situ scanning tunneling microscopy (STM) and compared to that of free clusters. Element specific magnetic studies performed by means of X-ray magnetic circular dichroism (XMCD) have shown that magnetic moments of Fe₅₀Co₅₀ alloy clusters are in good agreement with the theoretically expected values in the bulk. Our former investigations have shown that magnetic behaviour of clusters in this size regime becomes size and shape dependent, which makes structure analysis indispensable [1,2].

[1] J. Bansmann and A. Kleibert, Appl. Phys. A 80 (2005) 957

[2] M. Getzlaff et al., Appl. Phys. A 82 (2006) 95