Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Magnetic Thin Films II

MA 21.13: Vortrag

Mittwoch, 27. Februar 2008, 17:15–17:30, H 1012

Influence of argon-ion milling on perpendicular anisotropy of Co/Pt multilayer — •Norbert Franz, Matthias Jacobi, Leonid Lichtenstein, Hendrik Spahr, Hannes Zechlin, Holger Stillrich, and Hans Peter Oepen — Institut für Angewandte Physik, Universität Hamburg, Jungiusstr.11, 20355 Hamburg, Germany

For the fabrication of magnetic nanodots we use self- assembling masks built from micelles, which are copied into a ferromagnetic multilayer via ion milling. A prerequisite to successfully perfom these experiments is the investigation of the influence of sputtering on the magnetic properties of the films. Co/Pt multilayers (uncovered) with an easy perpen- dicular axis are made via magnetron/ion sputtering techniques. When bombarding the multilayers with 2 keV Ar⁺ we find a spin reorientation at small doses. For 500 eV ions, however, the multilayers stay vertical as long as they exhibit remanence. The magnetic anisotropy decreases almost instantly on bombardment with 500 eV Ar⁺ while the saturation signal stays constant. In the talk we will present the detailed evaluation of the saturation signal and the magnetic anisotropy as function of ion dose for 500 eV Ar⁺. We will discuss and compare results for a single and double Co/Pt bilayer.