Zero temperature spin wave damping in spin polarized He-3: Does it exist?

Previous spin echo experiments at equilibrium polarizations in He-3-He-4 mi xtures have confirmed the prediction of zero temperature polarization-induc ed spin wave damping in Fermi liquids. We have measured the damping of spin waves in dilute He-3, spin polarized by a He-4 circulating dilution refrig erator. The maximum polarization is almost a factor of 5 higher than the eq uilibrium polarization in a magnetic field of 10.54 T at temperatures betwe en 10 and 25 mK. The spin wave damping is much smaller than expected on the basis of the spin echo experiments and shows that the existence of polariz ation-induced spin wave damping is an open question.