Fast-exchange model visualized with 3He confined in aerogel: A Fermi liquid in contact with a ferromagnetic solid

He-3 confined in aerogel in the millikelvin temperature domain exemplifies a Fermi liquid in the presence of disorder. In confined He-3 systems, a solid layer of He-3 atoms forms on the confining medium. This system can then be viewed as a model system for the study of the (strongly interacting) Fermi liquid in contact with a (ferromagnetic) two-dimensional-like adsorbed solid. This interaction, studied experimentally through NMR T-2 experiments, is described in the framework of the fast-exchange model. A complete analytical description of the model is given, explaining our measurements as well as related normal-state confined He-3 NMR literature.