NEW MODES OF STABLE SPIN PRECESSION IN SUPERFLUID HE-3-B

The cw NMR response of He-3-B is investigated in large rf excitation f ields, which exceed in magnitude the equivalent of the spin-orbit coup ling. New states of stable spin precession are observed. The Leggett-T akagi spin-dynamic equations are solved numerically with the proper ex perimental parameters, the results are found to reproduce most of the experimental features, and allow an identification of the new modes. V ortex lines or vortex-free counterflow in the rotating superfluid have not been found to influence the measured NMR signatures of the new mo des.