Regensburg 2013 – scientific programme
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MA: Fachverband Magnetismus
MA 50: Poster II
MA 50.34: Poster
Friday, March 15, 2013, 10:30–13:30, Poster D
Magnetic vortices in permalloy cap structures in confined geometry — •Dennis Nissen1, Mi-Young Im2, Peter Fischer2, and Manfred Albrecht1 — 1Institute of Physics, Chemnitz University of Technology, D-09126 Chemnitz, Germany — 2Center for X-ray Optics, Lawrence Berkeley National Laboratory, California 94720, USA
Vortex states, which are characterized by the chirality of the in-plane magnetization and the out-of-plane component of the vortex core[1], are of great fundamental importance and relevant for application.
One approach to realize such magnetic vortex states is to manufacture large arrays of spherical SiO2-particle monolayers followed by film deposition of permalloy. In this way, it is possible to obtain magnetic cap structures on the particles forming vortex states[2].
We will present the fabrication process of spherical SiO2-particle monolayers with a particle diameter in the range between 50 nm and 4,5 µm, which act as templates for further film deposition, and furthermore the possibility to create particular particle arrangements using additional pre-patterns. Moreover, we will show investigations of the magnetic properties studied by magnetic force microscopy and magneto-optic Kerr effect magnetometry. In this context particular attention is paid to the magnetic reversal mechanism of a vortex as a function of external field. In addition, recent studies on the formation process of vortex states in large arrays of cap structures using magnetic transmission X-ray microscopy will be presented.
[1]T. Shinjo et al. Science 289 (2000) 930.
[2]R. Streubel et al. Phys. Rev. B 85, (2012) 174429.