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

FeGe1-xSbx:a series of novel kagome metals with noncollinear antiferromagnetism