  Spin-orbit (SO) fields in a spin-polarized electron gas are studied by
angle-resolved inelastic light scattering on a CdMnTe quantum well. We
demonstrate a striking organization and enhancement of SO fields acting on the
collective spin excitation (spin-flip wave). While individual electronic SO
fields have a broadly distributed momentum dependence, giving rise to
D'yakonov-Perel' dephasing, the collective spin dynamics is governed by a
single collective SO field which is drastically enhanced due to many-body
effects. The enhancement factor is experimentally determined. These results
provide a powerful indication that these constructive phenomena are universal
to collective spin excitations of conducting systems.
