Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Poster Session II
MA 48.14: Poster
Donnerstag, 10. März 2016, 15:00–18:00, Poster B1
Magnetoresistive detection of single magnetic vortices — •Lakshmi Ramasubramanian1,2, Ciarán Fowley1, Jürgen Lindner1, Jürgen Fassbender1,3, Attila Kákay1, Stefan Schulz2, Sibylle Gemming2, and Alina Maria Deac1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstraße 400, 01328 Dresden, Germany — 2Technische Universität Chemnitz, Elektrotechnik und Informationstechnik, 09126 Chemnitz, Germany. — 3Institute for Physics of Solids, TU Dresden, 01069 Dresden, Germany
The fundamental oscillation mode of magnetic vortices in thin-film elements has recently been exploited in spin-torque-driven nano-oscillators [A. Wachowiak et al., Science (2002)]. The fundamental frequency is determined by the saturation magnetisation, as well as the geometrical confinement of the magnetisation e.g. the diameter and height of a magnetic disk. The objective of this study is to design magnetic discs, contact them with electrical leads and probe the dynamics of the vortex structures using magnetoresistive detection. By varying the thickness and dimensions of the disk, requirements for the magnetic vortex as a ground state will be determined. The electrical resistance of a single disc is expected to change based on the relative angle between the magnetisation direction and the applied current (the anisotropic magnetoresistance (AMR) effect) [S. Kasai et al, PRL 97, 107204 (2006)]. Using the AMR as a detection technique we will determine if electrical detection of dynamics is feasible in this geometry and its associated limits.