  Kagome metals are important for exploring emergent phenomena due to the
interplay between band topology and electron correlation.Motivated by the
recent discovery of charge density wave in a kagome lattice antiferromagnetic
FeGe,we investigate the impact of Sb doping on the structural,charge and
magnetic order of FeGe.The charge density wave is rapidly suppressed by Sb
doping(~1.5%) and the antiferromagnetic ordering temperature gradually shifts
to 280K for FeGe0.7Sb0.3.For FeGe1-xSbx with x>0.1,crystal structures with
slightly distorted Fe kagome lattice are formed.Their magnetic anisotropy has
significant change,temperature driven spin-reorientation and field-induced
spin-flop transition are identified from magnetization
measurement.Interestingly,neutron diffraction reveals noncollinear
antiferromagnetic structures widely exist below TN for all sample with
x>0.1.This noncollinear magnetic orders could possibly be unconventional and
resulted from onsite repulsion and filling condition of kagome flat band,as
predicted by a recent theoretical work.
