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VOLUME 61 (1995) | ISSUE 11 | PAGE 910
Three-magnon decay of exchange spin wave
Observation of the parametric excitation of spin waves by a short spin wave with a wave number q~2X 105 cm-1 is reported. The experiment was carried out on a YIG film in which the anisotropy field varied smoothly along thickness. In this setting it was possible to linearly excite an initial wave and to observe intense emission at frequencies of parametrically generated waves. This emission can have an extremely narrow spectrum, with a linewidth of less than 1 kHz. © 1995 American Institute of Physics.