Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Micro- and Nanostructured Magnetic Materials I
MA 5.8: Vortrag
Montag, 22. März 2010, 12:45–13:00, H23
Magnetization Reversal in Arrays of Gold Nanoparticles Covered with Co/Pt Multilayers — •Carsten Schulze1, Denys Makarov1, Herbert Schletter1, Alan Craven2, Sam McFadzean2, Michael Hietschold1, Ulrike Wolff3, Volker Neu3, and Manfred Albrecht1 — 1Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany — 2Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK — 3IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany
The reversal process of Co/Pt multilayers with perpendicular magnetic anisotropy deposited on arrays of self assembled gold nanoparticles with sizes down to 20 nm has been investigated. The magnetic caps on 60 and 40 nm particles show a well defined single domain state. The observed magnetization reversal process suggests, that the neighboring caps are exchange coupled. In this respect, the single domain caps observed in an exchange coupled magnetic film are suggested to occur through the formation of metastable domain patterns such as bubble domains. The reversal behavior on magnetic films on planar substrate and on assemblies of 20-nm-sized particles was found to be similar, but with substantially different size of the magnetic domains. Careful investigation of the magnetization reversal suggests the presence of strong pinning of domain walls on inhomogeneities in the magnetic material due to the particles. The latter indicates that the dense assemblies of gold particles could be considered as a template to realize the concept of perpendicular percolated media [1].
[1] D. Suess et al., J. Appl. Phys. 99 (2006) 08G905