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Preludes to spin-wave chaos - spin-wave instability processes, butterfly curves, kinks, flips, cusps, and shifts.

Vorspiel zum Spinwellen-Chaos - Spinwellen-Instabilitätsprozesse mit Schmetterlingskurven, Abknicken, Sprüngen, Höckern und Verschiebungen
: Wilber, W.D.; Patton, C.E.; Srinivasan, G.; Jantz, W.; Wettling, W.

Journal of applied physics 64 (1988), No.10, pp.5401
ISSN: 0021-8979
ISSN: 1089-7550
Journal Article
Fraunhofer IAF ()
Chaos; Instabilität; Linienbreite; Spinwelle; Wellenvektor

Manifestations of chaos E1-3 above the threshold microwave field for spin-wave instability have brought this established topic in microwave magnetics back into vogue. This paper will review the nature of the instability onset and the factors which determine the variation of the threshold microwave field for instability (h(crit)) with dc field, the so-called "butterfly curve". A key factor here is the wave-vector k dependence of the spin-wave linewidth DeltaH(k). This k dependence leads to abrupt shifts in the wave number k for the unstable modes from large values (10 E5cm E-1) to small values (10 E3cm E-1) and a characteristic "kink" in the subsidiary absorption butterfly curve. Under certain circumstances, flips in the aximuthal spin-wave propagation angle are also predicted. Such flips show up experimentally in some of the expected circumstances, but not in others. (IAF)