▎ 摘　　要

We investigate the many-body effects of a magnetic adatom in ferromagnetic graphene by using the numerical renormalization group method. The nontrivial band dispersion of ferromagnetic graphene gives rise to interesting Kondo physics different from that in conventional ferromagnetic materials. For a half-filled impurity in undoped graphene, the presence of ferromagnetism can bring forth Kondo correlations, yielding two kink structures in the local spectral function near the Fermi energy. When the spin splitting of local occupations is compensated by an external magnetic field, the two Kondo kinks merge into a full Kondo resonance characterizing the fully screened ground state Strikingly, we find the resulting Kondo temperature monotonically increases with the spin polarization of Dirac electrons, which violates the commonsense belief that ferromagnetic bands are usually detrimental to Kondo correlations. Doped ferromagnetic graphene can behave as half-metals, where its density of states at the Fermi energy linearly vanishes for one spin direction but remains finite for the opposite direction. In this regime, we demonstrate an abnormal Kondo resonance that occurs in the first spin direction but is completely absent in the other one.