Parametric excitation of spin-waves in an yttrium iron garnet is studied within the coincidence regime of the first-order Suhl instability. Above the spin-wave instability threshold, a period-doubling cascade is observed. At this onset of chaos, the singularity spectrum f(α) is obtained. Experiments are performed at a pumping frequency of 3.3 GHz and at a temperature of 4.2 K. A sphere of an yttrium iron garnet (YIG) is wound with a driving coil and a pick-up coil, which are perpendicular with each other in the x-y plane. The static magnetic field, which is applied parallel to the  direction of YIG, are directed along the z-axis. Oscillations of the sample magnetization are detected as the induced voltage V(t) in the pick-up coil. The measurements are done in a field of 1308 Oe.
|Number of pages||2|
|Journal||Journal of Magnetism and Magnetic Materials|
|Volume||90 pt 91|
|Publication status||Published - 1990|
ASJC Scopus subject areas
- Condensed Matter Physics