Engineering magnetic anisotropy and ferromagnetism in topological Kagome metal GdV₆Sn₆ via Nd substitution

The RM₆X₆ (R = rare earth, M = transition metal, X = Sn/Ge) family of Kagome metals hosts a variety of emergent phenomena, where the rare-earth R site serves as a powerful knob for controlling magnetism. In this work, we show that Nd substitution for Gd in the topological Kagome metal GdV₆Sn₆ provides a striking tunability. We report a systematic transformation of the magnetic ground state from antiferromagnetic in GdV₆Sn₆ to ferromagnetic with Nd-substitution, which is accompanied by the drastic change from nearly isotropic, easy-plane antiferromagnetism in GdV₆Sn₆ to strongly anisotropic, c-easy axis ferromagnetism. This engineered magnetism is directly manifested in magnetotransport. Our findings establish rare-earth substitution as a precise method for designing magnetic anisotropy and ferromagnetism in Kagome lattices, paving a way for tailored spintronic devices and the exploration of topological magnetic phases.