Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 12: Nanostructures at surfaces: Dots, particles, clusters I (magnetic)

O 12.1: Vortrag

Montag, 23. März 2009, 15:00–15:15, SCH A215

Correlation of shape and magnetic anisotropy of mass-filtered Fe and FeCo alloy nanoparticles supported by W(110) — Armin Kleibert¹, •Furkan Bulut², Kerstin Gebhardt³, Wolfgang Rosellen³, Daniela Sudfeld⁴, Johannes Passig¹, Joachim Bansmann², Karl-Heinz Meiwes-Broer¹, and Mathias Getzlaff³ — ¹Institut für Physik, Universität Rostock, Germany — ²Institut für Oberflächenchemie und Katalyse, Universität Ulm, Germany — ³Institut für Angewandte Physik, Universität Düsseldorf, Germany — ⁴Institut für Experimentalphysik, Universität Duisburg-Essen, Germany

Magnetic clusters and nanoparticles are promising candidates for many future applications. Understanding and controlling their magnetic anisotropy energy (MAE) is important, particularly when attempting, e.g., to overcome the so-called superparamagnetic limit in high density storage devices. In the present work we study shape and interface related contributions to the MAE of supported nanoparticles. For this purpose mass-filtered Fe and FeCo nanoparticles have been deposited onto a bare W(110) surface. The structure and shape of the nanoparticles were determined by ex situ high resolution transmission electron microscopy. In situ scanning tunneling microscopy yields evidence for a partial flattening of the supported particles. Magnetization curves reveal a magnetic hard axis perpendicular to the surface. The observed MAE is compared to model calculations on shape and interface anisotropy contributions of flattened nanoparticles.[1]

[1] A. Kleibert et al., J. Phys.: Condens. Matter 20, 445005 (2008).