3-MAGNON DECAY OF EXCHANGE SPIN-WAVE

Nonlinear properties of short-wavelength exchange-dominated spin waves in ferrite films have beet studied experimentally. Collinear splittin g of exchange spin waves into two waves has been observed. An yttrium- iron-garnet film with smooth variation of the uniaxial anisotropy fiel d through the film thickness has been used for the experimental study. Nonuniformity of the file provided both the linear excitation of shor t-wavelength pumping wave and the detection of the radiation caused by the parametrically excited waves.