Ferromagnetic state above room temperature in a proximitized topological Dirac semimetal

Abstract

We report an above-room-temperature ferromagnetic state realized in a proximitized Dirac semimetal, which is fabricated by growing typical Dirac semimetal Cd${}_3$As${}_2$ films on a ferromagnetic garnet with strong perpendicular magnetization. Observed anomalous Hall conductivity with substantially large Hall angles is found to be almost proportional to magnetization and opposite in sign to it. Theoretical calculations based on first-principles electronic structure also demonstrate that the Fermi-level dependent anomalous Hall conductivity reflects the Berry curvature originating in the split Weyl nodes. The present Dirac-semimetal/ferromagnetic-insulator heterostructure will provide a novel platform for exploring Weyl-node transport phenomena and spintronic functions lately proposed for topological semimetals.

15 pages, 4 figures

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• Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
• Intrinsic vs. extrinsic anomalous Hall effect in ferromagnets
• Above 400 K Robust Perpendicular Ferromagnetic Phase in a Topological Insulator
• Quantum Hall states observed in thin films of Dirac semimetal Cd3As2
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Cited by in corpus (6)

• Topological Hall effect in the antiferromagnetic Dirac semimetal EuAgAs
• Enhancement of spin-orbit coupling in Dirac semimetal Cd${}_3$As${}_2$ films by Sb-doping
• Enhancement of the Thermoelectric Figure of Merit in the Dirac Semimetal Cd${}_3$As${}_2$ by Band-Structure and -Filling Control
• Nodal lines and boundary modes in topological Dirac semimetals with magnetism
• Edge and bulk states in Weyl-orbit quantum Hall effect as studied by Corbino measurements
• Anisotropy of the spin Hall effect in a Dirac ferromagnet