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KR: Fachgruppe Kristallographie

KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)

KR 5.87: Poster

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

Reliable nucleation of isolated antivortices in taylored ferromagnetic microstructures — •Matthias F.A. Pues, Michael Martens, Thomas Kamionka, and Guido Meier — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Germany

Magnetic antivortices are topological singularities in ferromagnetic thin-film microstructures. They can be distinguished from their counterparts, the vortices, by a negative winding number. In combination, both are common in so-called cross-tie walls.

The isolation of a single antivortex is challenging [1]. We designed particularly shaped elements that facilitate a reliable nucleation and a stabilization of a single antivortex. This is shown by measurements of the anisotropic magnetoresistance (AMR) and magnetic force microscopy (MFM). The process of the nucleation can be understood by means of micromagnetic simulations.

Since antivortices behave like two-dimensional oscillators, the simultanious generation of multiple antivortices opens new opportunities for the analysis of antivortex dynamics [2], e.g. through ferromagnetic resonance measurements (FMR).

[1] K. Shigeto et al., Appl. Phys. Lett. 80, 4190 (2002)

[2] T. Kamionka et al., Phys. Rev. Lett. 105, 137204 (2010)