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Weyl semimetals (WSM) have been extensively studied due to their exoticproperties such as topological surface states and anomalous transportphenomena. Their band structure topology is usually predetermined by materialparameters and can hardly be manipulated once the material is formed. Theirunique transport properties appear usually at very low temperature, which setschallenges for practical device applications. In this work, we demonstrate away to modify the band topology via a weak magnetic field in a ferromagnetictopological semimetal, Co2MnAl, at room temperature. We observe a tunable,giant anomalous Hall effect, which is induced by the transition between Weylpoints and nodal rings as rotating the magnetization axis. The anomalous Hallconductivity is as large as that of a 3D quantum anomalous Hall effect (QAHE),with the Hall angle reaching a record value (21%) at the room temperature amongmagnetic conductors. Furthermore, we propose a material recipe to generate thegiant anomalous Hall effect by gaping nodal rings without requiring theexistence of Weyl points. Our work reveals an ideal intrinsically magneticplatform to explore the interplay between magnetic dynamics and topologicalphysics for the development of a new generation of spintronic devices.

Giant room temperature anomalous Hall effect and magnetically tuned topology in the ferromagnetic Weyl semimetal Co2MnAl