Tailoring Topological States and Anomalous Transport via Magnetization Direction in MnSb

Based on first‐principles calculations and symmetry analysis, we report a magnetization‐orientation‐controlled topological phase transition and anomalous transport effects in hexagonal MnSb. Owing to its remarkably low magnetic anisotropy energy (0.465 meV), the magnetization direction in MnSb can be readily manipulated by external perturbations. Without spin‐orbit coupling (SOC), a symmetry‐protected Dirac point (DP) lies 9 meV below the Fermi level. Upon inclusion of SOC, this DP undergoes an evolution as a function of magnetization orientation: it opens a gap at θ = 0° (magnetization along the a ‐axis) due to the symmetry breaking, and transforms into four Weyl points at θ = 90° (magnetization along the c ‐axis). These topological transitions are accompanied by significant Berry curvature reconstruction, which profoundly influences the anomalous transport responses. Specifically, the anomalous Hall conductivity increases monotonically from –100.64 Ω −1 cm −1 at θ = 0° to a maximum of –754.72 Ω −1 cm −1 at θ = 90°, whereas the anomalous Nernst coefficient undergoes a sign reversal, changing from +0.50 Am −1 K −1 to –0.09 Am −1 K −1 as the magnetization rotates. Our work establishes a design principle for engineering magnetic topological materials, with MnSb serving as a representative example to explore the interplay between magnetic order and topology‐driven transport phenomena. These findings bridge magnetism, topology, and transport physics, opening a pathway toward novel spintronic devices through tunable magnetization direction.