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Control of extended fast complex systems with spatio-temporal delayed feedback |
| Cooperation with the group " Nonlinear Spin Dynamics", Institute of Condensed Matter Physics,
TU Darmstadt and supported by the German Research Foundation
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| Project Leader: Prof. Dr. Hartmut Benner, PD Dr. Wolfram Just, Prof. Dr. Günter Radons |
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The main scope of the project is control in spatially extended chaotic systems using
spatiotemporal delayed feedback. New and robust control methods will be developed for the
stabilisation of fast spatiotemporal structures. From the experimental point of view complex
electronic networks and ferromagnetic films are of main interest. Based on analytical
approaches, numerical simulations, and real experiments we investigate how limitations,
e.g. of topological origin, can be relaxed by modifications of the control method. As an
application we intend to select and stabilise dynamical patterns in yttrium iron garnet (YIG)
films beyond the first order Suhl threshold.
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Experimental bifurcation diagram for high-power ferromagnetic resonance on a YIG sphere (ν = 9.26 GHz) with respect to magnetic field H and input microwave power Pin. The lowest line indicates the Suhl threshold, the lines above seperate regimes of different time behaviour, e.g. period doublings (P2, P4), quasiperiodicity (QP), different types of intermittency (INT II, INT III) or chaos. |
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