  Ultracold atomic spin mixtures develop rich and intriguing magnetic
properties when an external radiation coherently couples different spin states.
In particular, the coupled mixture may acquire a critical behavior when the
spin interactions equal the coupling energy. However, atomic mixtures generally
feature a relatively high sensitivity to magnetic fields that can set a
limitation to the observable phenomena. In this article, we present an overview
of experimental studies of magnetism based on superfluid multicomponent gases
in an ultrastable magnetic field environment, which recently became available.
