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A combination of small-cluster exact-diagonalization calculations and awell-controlled approximative method is used to examine the ground-state phasediagrams of the spin-one-half Falicov-Kimball model extended by thespin-dependent on-site interaction ($J$) between localized spins and itinerant($d$) electrons, as well as by external magnetic field ($h$). Both the magneticordering and metamagnetic transitions are analysed as functions of $h$ and thenumber of itinerant electrons ($N_d$) at selected $J$. Various magneticsuperstructures including axial and diagonal spin stripes are observed fornonzero values of $J$ and $h$. Moreover, it is shown that increasing $h$strongly stabilizes the fully and partially polarized states, while the nonpolarized state is reduced.Comment: 11 pages, 4 figure

MAGNETIC PHASE DIAGRAMS OF THE GENERALIZED SPIN-ONE-HALF FALICOV–KIMBALL MODEL