The kagome lattice motif has attracted interest for investigating the relationship between magnetic behaviors and topology. Materials containing two magnetic sublattices of distinct energy scales are known to induce spin frustration and tunable fire-ice ferrimagnetic states. Here we report the growth of single crystals of the kagome magnet $\mathrm{TbF}{\mathrm{e}}_{6-x}\mathrm{C}{\mathrm{o}}_x\mathrm{G}{\mathrm{e}}_6$ (nominal $x=0-6$). The substitution of Co into the Fe-based kagome lattice is accompanied by a structural transition from the more ordered $\mathrm{TbF}{\mathrm{e}}_6\mathrm{S}{\mathrm{n}}_6$-type structure to the fully disordered $\mathrm{Y}{\mathrm{b}}_{0.5}\mathrm{C}{\mathrm{o}}_3\mathrm{G}{\mathrm{e}}_3$-type structure. Reflections related to $\mathrm{TbF}{\mathrm{e}}_6\mathrm{S}{\mathrm{n}}_6$-like superstructure ordering in single crystal x-ray diffraction images gradually dissipate with the addition of Co. Anisotropic magnetic measurements indicate an easy-plane (in-plane with the kagome slab) magnetic anisotropy in all members, as well as evidence of Tb ordering in the Co endmember. High-temperature magnetic susceptibility data indicates possible Co-doping induced suppression of magnetic ordering of the Fe sublattice. The progression of structural and magnetic order with Co doping enhances understanding of the evolution of stuffed CoSn structure types and the interplay between $f$- and $d$-block magnetic sublattices.

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• Dopants
• Doping effects
• Ferrimagnetism
• Frustrated magnetism
• Magnetic anisotropy
• Magnetic susceptibility
• Transition temperature