BRILLOUIN LIGHT-SCATTERING AND MAGNON WAVE VECTOR DISTRIBUTIONS FOR MICROWAVE-MAGNETIC-ENVELOPE SOLITONS IN YTTRIUM-IRON-GARNET THIN-FILMS

Brillouin light scattering has been used to measure wave number k(m) a nd wave vector k(m) angle distributions for 5 GHz magnetostatic backwa rd-volume-wave envelope solitons in yttrium-iron-garnet thin films. Fo r moderate powers, the data revealed spin waves directly associated wi th the solitons with k(m) values in the +/-300 rad/cm range. For high powers, the data showed high k(m) pin waves in the 2500-5000 rad/cm ra nge with discrete in-plane k(m) directions at 90 degrees and other ang les around 90 degrees relative to the soliton propagation direction. T hese high k(m) spin waves provide the first direct evidence of spin wa ve shedding associated with solitons at high powers.