In a 2D model with a short-range repulsion, the fully spin-polarized half-metal phase has an attractive odd-parity pairing interaction from two-magnon exchange, with a pairing scale possibly reaching a substantial fraction of the Fermi energy.
However, this calculation goes beyond the level of our approximations
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Superconductivity via paramagnon and magnon exchange in a 2D near-ferromagnetic full metal and ferromagnetic half-metal
In a 2D model with a short-range repulsion, the fully spin-polarized half-metal phase has an attractive odd-parity pairing interaction from two-magnon exchange, with a pairing scale possibly reaching a substantial fraction of the Fermi energy.