Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.78: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Susceptibility measurements of Ni clusters embedded in organic matrices — •Mariella Denk, Robert Mittermair, Daniel Queteschiner, Richard Denk, Michael Hohage, Lidong Sun, and Peter Zeppenfeld — Institut für Experimentalphysik, Johannes Kepler Universität Linz, A-4040 Linz, Austria

Reflectance Difference-Magneto Optic Kerr spectroscopy (RD-MOKE) and Atomic Force Microscopy (AFM) was used to study the morphologic and magnetic properties of organic magnetic molecules, namely, cobalt tetramethoxyphenylporphyrin (CoTMPP) on Cu(110)-(2x1)O. The magneto optic Kerr signal of the organic molecules strongly depends on the photon energy [1]. Thick layers (≈ 100 nm) of organic molecules were used as host material for subsequent Ni cluster growth. The size, shape and distribution of the Ni particles strongly influences their optical and magnetic properties. By using an embedding organic matrix, we try to tune the interparticle interactions as well as the coupling between the organic molecules and the metal clusters, which, for instance, will affect the superparamagnetic limit of the nanoparticles. In order to address superparamagnetic effects the experimental setup was upgraded to measure the magnetic susceptibility, directly, and over the whole spectral range from 1.5 to 5 eV.

[1] M. Fronk, B. Bräuer, J. Kortus, O. G. Schmidt, D. R. T. Zahn and G. Salvan, Phys. Rev. B 79, 235305 (2009)