MAGNETIC DISSIPATION IN SUPERFLUID HE-3-B IN THE TRANSITION REGIME TONONHYDRODYNAMIC CONDITIONS

We have applied the so-called HPD spectroscopy, i.e. the NMR of the ho mogeneously precessing domain (HPD) in superfluid He-3-B, to study the magnetic relaxation processes down to 0.3T(c). The power absorbed by HPD from cw NMR rf-field was divided into several contributions corres ponding to different relaxation processes. From these contributions no nhydrodynamic corrections to spin diffusion and Leggett-Takagi (L-T) r elaxation were extracted for a pressure of 6 bar. Below 0.45T(c) a lar ge absorption term linear with the HPD length and increasing with the falling temperature was observed. This term could be associated with a n instability of coherent precession in the nonhydrodynamic regime. Th e process of the HPD formation in the nonwetting regime, for T < 0.37T (c), was observed and described leading to a new possibility to determ ine the d-constant of the surface energy.