We report an above-room-temperature ferromagnetic state realized in a proximitized Dirac semimetal, which is fabricated by growing typical Dirac semimetal Cd3As2 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.
@article{arxiv.1912.11964,
title = {Ferromagnetic state above room temperature in a proximitized topological Dirac semimetal},
author = {Masaki Uchida and Takashi Koretsune and Shin Sato and Markus Kriener and Yusuke Nakazawa and Shinichi Nishihaya and Yasujiro Taguchi and Ryotaro Arita and Masashi Kawasaki},
journal= {arXiv preprint arXiv:1912.11964},
year = {2019}
}