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MA: Fachverband Magnetismus

MA 27: Magnetic Thin Films II of 2

MA 27.1: Vortrag

Mittwoch, 13. März 2013, 15:00–15:15, H3

Dynamics of a magnetic bubble in thin films with perpendicular anisotropy — •B. Krüger¹, F. Büttner^1,2, C. Moutafis³, M. Schneider², C. Günther², J. Geilhufe⁴, J. Mohanty², C. v. Korff Schmiesing², J. Franken⁵, M. Foerster¹, T. Schulz¹, C. Vaz³, H. Swagten⁵, S. Eisebitt^2,4, and M. Kläui¹ — ¹Uni Mainz, Germany — ²TU Berlin, Germany — ³PSI, Villigen, Switzerland — ⁴HZB, Berlin, Germany — ⁵TU Eindhoven, Netherlands

Magnetic bubbles are circular bi-domain states in perpendicular magnetic thin films. The magnetization structure with the curling in-plane domain wall defines a topology, which determines the equation of motion. It was predicted that the lowest lying eigenmode motion is not circular [1], in contrast to observations on magnetic vortices, which are the in-plane analogous of bubbles. These differences can be explained by a recent analytical model[2], which describes the displacement of the bubble by two waves that travel along the domain wall at different speeds and in opposite directions. This results in an effective mass of the bubble, whereas the vortex is described as a massless particle.

Using X-ray holographic imaging, we image the gyration of a bubble and we present the experimental determination of the trajectory. We demonstrate the good agreement with our theoretical model, allowing us to determine the eigenfrequencies and the effective mass of the bubble domain.

[1] C. Moutafis et al., PRB 79, 224429 (2009).

[2] I. Makhfudz et al., PRL 109, 217201 (2012).