Efficient room-temperature magnetization direction detection by means of the enhanced anomalous Nernst effect in a Weyl ferromagnet

The topological nature of Heusler-alloy-based Weyl ferromagnet, Co₂MnGa, results in an abundance of intriguing physical phenomena. In this work, a colossal enhancement of unidirectional magnetoresistance induced by the large anomalous Nernst effect is realized in nano-sized wires, which enables the operation of a prototypical non-volatile all-electric two-terminal memory device at room temperature. A size scaling investigation indicates that there is further room for improving the magnetoresistance ratio. These findings can pave a new avenue for creating efficient thermo-spintronic devices using novel topological materials.