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The tuning of magnetic phase, chemical potential, and structure is crucial toobserve diverse exotic topological quantum states in $MnBi_2Te_4(Bi_2Te_3)_m$(m = 0, 1, 2, & 3). Here we show a ferromagnetic (FM) phase with a chiralcrystal structure in $Mn(Bi_{1-x}Sb_x)_4Te_7$, obtained via tuning the growthconditions and Sb concentration. Unlike previously reported$Mn(Bi_{1-x}Sb_x)_4Te_7$, which exhibits FM transitions only at high Sb dopinglevels, our samples show FM transitions ($T_C$ = 13.5 K) at 15%-27% dopinglevels. Furthermore, our single crystal x-ray diffraction structure refinementsfind Sb doping leads to a chiral structure with the space group of P3,contrasted with the centrosymmetric P-3m1 crystal structure of the parentcompound $MnBi_4Te_7$. Through ARPES measurements, we also demonstrated thatthe non-trivial band topology is preserved in the Sb-doped FM samples. Giventhat the non-trivial band topology of this system remains robust for low Sbdoping levels, our success in making FM $Mn(Bi_{1-x}Sb_x)_4Te_7$ with $x$ =0.15, 0.175, 0.2 & 0.27 paves the way for realizing the predicted topologicalquantum states such as axion insulator and Weyl semimetals. Additionally, wealso observed magnetic glassy behavior in both antiferromagnetic $MnBi_4Te_7$and FM $Mn(Bi_{1-x}Sb_x)_4Te_7$ samples, which we believe originates fromcluster spin glass phases coexisting with long-range AFM/FM orders. We havealso discussed how the antisite Mn ions impact the interlayer magnetic couplingand how FM interlayer coupling is stabilized in this system.

Ferromagnetic MnBi4Te7 obtained with low concentration Sb doping: A promising platform for exploring topological quantum states