Low field ringing in the ³He B phase

It is shown that when a small field H is turned off the magnetization of the B phase of ³He will ring at two frequencies, the longitudinal resonance frequency discussed by Leggett and a transverse resonance frequency given by √ 2 5 γH. The latter mode is transverse in the sense that it describes the precession of the magnetization perpendicular to the anisotropy axis in the B phase. This mode may describe the recent experimental data of Webb et al.