Stable spin precession at one half of equilibrium magnetization in superfluid He-3-B

New modes of spin precession have been observed in superfluid He-3-B with a precessing magnetization M = pM(eq), where p = 1, 1/2, and approximate to 0. These dynamic order parameter states are the first examples of stable precession with a magnetization different from the equilibrium value M(eq). The p = 1/2 mode is the second example of a phase-coherent state of a spin superfluid, The new states can be excited close to T-c in the range 1 - T/T-c less than or similar to 0.02 where dissipation is low and the energy barriers between the different local minima of the spin-orbit energy are small.