Dresden 2011 – scientific programme
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.100: Poster
Tuesday, March 15, 2011, 10:45–13:00, P2
Dynamics of bubble domains in perpendicular anisotropy dots — C. Moutafis1,2, A. Bisig1,2, J. Rhensius1,2,3, F. Büttner1,6, •P. Wohlhüter1,4, T. Thomson5, G. Heldt3, L. Heyderman3, M. Weigand6, S. Eisebitt7, and M. Kläui1,2 — 1SwissFEL, PSI, CH — 2Laboratory for Nanomagnetism & Spin Dynamics, EPFL, CH — 3Laboratory for Micro- & Nanotechnology, PSI, CH — 4Fachbereich Physik, Universität Konstanz — 5University of Manchester, UK — 6MAXYMUS, BESSY, Berlin — 7Institut für Optik und Atomare Physik, TU Berlin
We study the dynamical response of magnetic bubbles in nanoscale dots with perpendicular anisotropy. Magnetic bubble domains in such dots have been predicted to exhibit rich dynamics dominated by their Skyrmion number N, which reflects their underlying spin structure [1,2]. Specifically, the gyrotropic motion of the symmetric, N=1, bubble (analogous to the gyrotropic mode of the magnetic vortex) was calculated recently for the first time [2]. Here, we attempt to show the bubble's response to external excitations. By using soft X-ray holography we image the magnetic states in CoPd dots of varying geometry and we also identify a bubble in certain diameter for a range of magnetic fields. Furthermore, we use Scanning X-ray Transmission Microscopy to image CoPt dots excited by various field pulses. We image the movement/shift of the bubble between different pinning sites in a dot. In addition, we calculate additional characteristic eigenmodes of the basic N=1 bubble. References: [1] Moutafis et al. Phys.Rev.B vol. 76, 104426 (2007) [2] Moutafis et al. Phys.Rev.B vol. 79, 224429 (2009)