Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)

MA 19.111: Poster

Tuesday, March 15, 2011, 10:45–13:00, P2

Domain Structures and Hysteresis Loops in Coupled Permalloy Rectangles — •Jonas Jelli, Kristof M. Lebecki, and Ulrich Nowak — Department of Physics, University of Constance, Germany

Arrays of 2 µm x 1 µm x 20 nm Permalloy thin film elements of rectangular shape with varying interelement separation between the long edges are investigated by micromagnetic simulation. Applying one dimensional periodic boundary conditions [1], the influence of the rectangle’s magnetostatic interactions on the domain structures and the shape of hysteresis loops is studied. By analyzing the angular distribution of the magnetization it is found that the coupled elements show a flux-closure Landau state whose large domains increasingly split up into two distinct domains the smaller the spacing between the rectangles is chosen. This is in good agreement with experiments in which this tendency is also observed [2]. Besides, magnetisation hysteresis loops indicate a change in the coercive field of the rectangles depending on their spacing and whether the external field is applied in the direction of periodicity or perpendicularly.

[1] K. M. Lebecki et al, J. Phys. D 41, 175005 (2008)

[2] S. Hankemeier et al, Phys. Rev. Lett. 103, 147204 (2009)