Tuning the Anomalous Hall Conductivity of Hcp‐Cobalt by Constant‐Volume Biaxial Strain

Abstract

Controlling the anomalous Hall effect (AHE) is crucial for advancing spintronic devices. In this work, we investigate how constant‐volume biaxial strain affects the intrinsic anomalous Hall conductivity (AHC) of hexagonal close‐packed (hcp) cobalt. The calculations combine first‐principles density functional theory (DFT) with a Wannier‐based tight‐binding model. Our results reveal a non‐monotonic AHC response to applied strain. The conductivity reaches a maximum under small compressive strain and is suppressed more rapidly by larger compressive strain than by equivalent tensile strain. We examine microscopically how strain shifts the energy position of anti‐crossing band features near the Fermi level. This shift drives a redistribution of the Berry curvature hotspots. These results confirm constant‐volume biaxial strain as a viable approach to tuning the intrinsic AHE in hcp cobalt. © 2026 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.