Jw. Boyle et al., NONLINEAR SELF-CHANNELING AND BEAM SHAPING OF MAGNETOSTATIC WAVES IN FERROMAGNETIC-FILMS, Physical review. B, Condensed matter, 53(18), 1996, pp. 12173-12181
Self-channeling and nonlinear beam shaping of magnetostatic waves in t
hin in-plane magnetized yttrium-iron-garnet films have been observed.
Different power levels of a cw signal were launched into a magnetic fi
lm using a short microstrip antenna. A Brillouin light scattering syst
em was used to observe the profile of the beams. Self-channeling of th
e magnetostatic wave beam occurred because of the interplay between th
e diffraction of the beam and nonlinearity, which leads to self-focusi
ng. This was observed as the input power reached a threshold value equ
al to a few hundred milliwatts. A discussion of the observations is pr
esented, together with estimates of the parameter ranges.