Tunable Transport in Topological Metal Mn2Au for Spintronics Applications

Antiferromagnetic materials are actively being explored for spintronic applications due to their zero net magnetic moment, insensitivity to magnetic fields, and novel magneto-electronic properties, including giant magnetoresistance and spin-orbit torque. Mn₂Au is one such antiferromagnet that has been widely used for spintronics applications, due to its high spin-orbit torque efficiency and exceptionally high Néel temperature. Here we demonstrate that the antiferromagnetism breaks time reversal symmetry and leads to a Weyl metal phase in this material. We also demonstrate how the transport properties of Mn₂Au can be modulated by changing the orientation of the magnetic moments to shift the Weyl point positions. We discuss how the predictions of Weyl physics in Mn₂Au might lead to potential new functionalities in this antiferromagnetic spintronics material.