Spin-wave phenomena in liquid3He systems

The magnetic effects predicted by Leggett and Rice for Fermi liquids in the collisionless regime have been verified. Spin-echo measurements are reported which demonstrate the existence of spin waves and undamped spin currents in liquid³He and dilute³He-⁴He solutions. The experimental results are compared with the theoretical expressions of Leggett and Rice, and values of the Fermi liquid interaction parameter $$lambda = left[ {1/(1 + F_0^a )} right] - left{ {1/[1 + (F_1^a /3)]} right}$$ are derived for three samples: liquid³He atP=0 and 27 atm, and a 6.4%³He-⁴He solution. In addition, some techniques for direct observation of individual spin-wave modes are explored and the results reported.