of Sciences of the USSR, Saratov Branch, Saratov / 410720 USSR Routes to chaos and automodulation under nonlinear MSW propagation in epitaxial films and monocrystall slabs of YIG were investigated.In the r? ion of the first-order Suhl instability ( Fig.1) of surface MSW ?MSSW) chaotic spectra with properties and magnetic field (H) dependence similar 50 that of the case kinetic instability of parametric spin waves 93was observed. Chaotic spectra have maximum intensity at the double FMR frequency 2fH, fH=Hi, (4% M O <3H<61M0) and frequency interval Af=2f +f, f -MSS'VV frequency, f>2fIf Af was small the prechaotic s ectra had satellites which bgiadened with increased MSSN power t P) and disappeared with chaotic spectra created there after. For frequency f near upper MSSW frequency band f -f +2mM0, so the bf was larger (f -fc d f) route to chaos w& gbserved without any selfoscillatfons in prechaotic motion. Analogous chaotic spectra but only for smalldf in the first-order Suhl instability of forward volume MSW (FVMSW) were observed (3H<165MO, f -x(H-49 M?)).In the region of second-order Suhl instabilia; of FVMSrV (f € f ( 2 f ) universal period-doubling bifurcation and distruction 8f two-Yrequency qwasiperiodic motion routes to chaos were observed (Fig.2). More obviously these routes were observed in region of high dispersion. Based on nonlinear Schrodinger equation with dissipation the development of FVMSW modulation instability was investigated. Possibility of period-doubling bifuscation and distruction of quasiperiodic motion routes to chaos shown. Fig.1. Creation of MSW noise spectra vs input power A) MSSW, (111) film, 5 mkm, H,=600 Oe, Pth=l.5 mW B) MFW, ( 1 1 0 ) plate, 40 mkm, H0=1970 Oe,Pth=1.2 mW I
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