Chaos and chaotic transients in yttrium iron garnet (invited)

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Abstract
Long-lived chaotic transients are a prominent feature of the spin-wave behavior of spheres of yttrium iron garnet (YIG) being perpendicularly pumped in the region of the first-order Suhl instability. These transients may appear after a sudden increase in rf pumping power or during transitions between quasiperiodic auto-oscillations. The transients, which result from the collision of a chaotic attractor with the basins of attraction of multiple stable quasiperiodic attractors, vary in lifetime by more than six orders of magnitude, from milliseconds to hours, as a function of the rf driving field. The average lifetimes of these transients fit an extended Grebogi–Ott–Yorke scaling law. Roughening the surface of the YIG sphere drastically changes the behavior of these transients.

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