Giant Manipulation of the Non-collinear Orientation and Topological-like Hall Effect in Antiferromagnetic Mn3Ge

Non-collinear antiferromagnetic materials exhibit extraordinary physical phenomena, showing great potential in high-density and low-power spintronic devices. Here, three sets of high-quality non-collinear antiferromagnetic Mn3Ge films were fabricated by controlling the thermodynamic growth conditions, enabling the modulation of spin orientations within the Kagome lattice. The spin-oriented Kagome lattices with inverse triangular magnetic orders break the hexagonal symmetry in two different crystal planes of [202̅0] and [0002] orientations. The composite film consisting of mixed orientations exhibits topological characteristics. Furthermore, through systematically investigating the transport behaviors, the magnetic domain structures evolution, and the time-resolved magneto-optical Voigt effect, it is revealed that the topological characteristics do not come from the topological Hall effect but from the superposition of anomalous Hall effect signals with opposite signs and different coercive forces. Our work provides new horizons for the effective manipulation of the crystal orientation, spin texture, and “topological-like” transport behavior in non-collinear antiferromagnetic materials.