  We analyse the asymptotic symmetries of electromagnetism non-minimally
coupled to scalar fields, with non-minimal couplings of the Fermi type that
occur in extended supergravity models. Our study is carried out at spatial
infinity where minimal and non-minimal couplings exhibit very different
asymptotic properties: while the former generically cannot be neglected at
infinity, the latter can. Electromagnetic non-minimal couplings are in that
respect similar to gravitational minimal couplings, which are also
asymptotically subdominant. Because the non-minimally interacting model is
asymptotic to the free one, its asymptotic symmetries are the same as the ones
of the free theory, i.e., described by angle-dependent $u(1)$ gauge
transformations. We also analyse the duality symmetry and show that it is
broken to its compact subgroup by the asymptotic conditions. Finally, we
consider logarithmic gauge transformations and use them to simplify the
symmetry algebra.
