Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 23: Micro- and Nanostructured Magnetic Materials

MA 23.6: Talk

Wednesday, April 2, 2014, 11:00–11:15, HSZ 403

Switching modes in a self-assembled antidot array — Felix Haering¹, •Ulf Wiedwald^1,2, Steffen Nothelfer¹, Berndt Koslowski¹, Paul Ziemann¹, Lorenz Lechner³, Andreas Wallucks⁴, Kristof Lebecki⁴, Ulrich Nowak⁴, Joachim Gräfe⁵, Eberhard Goering⁵, and Gisela Schütz⁵ — ¹Institute of Solid State Physics, Ulm University, 89069 Ulm — ²Faculty of Physics, University of Duisburg-Essen, 47057 Duisburg — ³Electron Microscopy Group of Materials Science, Ulm University, 89069 Ulm — ⁴Department of Physics, University of Konstanz, 78457 Konstanz — ⁵Max Planck Institute for Intelligent Systems, 70569 Stuttgart

We study the magnetic reversal in a self-assembled, hexagonally ordered Fe antidot array (period 200 nm, antidot diameter 100 nm) which was prepared by nanosphere lithography [1]. Direction-dependent information in such a self-assembled sample is obtained by measuring the anisotropic magnetoresistance (AMR) through constrictions processed by focused ion beam milling in nearest neighbor and next nearest neighbor directions [2]. We show that such an originally integral method can be used to investigate the strong 6-fold in-plane anisotropy introduced by the antidot lattice. In-field magnetic force microscopy, Kerr microscopy and micromagnetic simulations are employed to correlate the microscopic switching to features in the AMR signal. We thank the Baden-Württemberg Stiftung for financial support. [1] F. Haering et al., Nanotechnology 24, 055305 (2013). [2] F. Haering et al., Nanotechnology 24, 465709 (2013).