Suppression of triplet superfluidity near magnetically-active surfaces

Recent experiments investigating properties of the chiral A phase of superfluid He-3 in thin slabs (P. Heikkinen et al, arXiv:1909.04210) revealed unusually large T_c suppression that exceeds the fully-diffusive scattering limit. This requires re-thinking of the boundary conditions, and inclusion of magnetic degree of freedom to describe scattering of the quasiparticles on surfaces that are covered my magnetically-active solid layer of He-3 atoms. I will review existing models of magnetic scattering to prove that they cannot, in principle, give such suppression of the A phase. I will show that in order to explain the large T_c suppression, the internal quantum degrees of freedom of the solid spins have to be taken into account.