APL Materials (Aug 2022)

Electric field control of anomalous Hall effect in CaIrO3/CaMnO3 heterostructure

  • R. Nishino,
  • T. C. Fujita,
  • M. Kawasaki

DOI
https://doi.org/10.1063/5.0097881
Journal volume & issue
Vol. 10, no. 8
pp. 081104 – 081104-5

Abstract

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We demonstrate an electric field control of an anomalous Hall effect emerging in CaIrO3/CaMnO3 heterostructures. We fabricate both electron-type and hole-type carrier samples by tuning epitaxial strain and, then, control the carrier density in a CaIrO3 layer via electric double layer gating technique. As the Fermi energy of CaIrO3 is tuned close to the Dirac line node, anomalous Hall conductivity is enlarged in both carrier-type samples. This result reveals that the anomalous Hall effect comes from the intrinsic origin, reflecting the Dirac-like dispersion in CaIrO3. We propose that band splitting induced by the interface ferromagnetism yields several band crossing points near the Dirac line node. These points act as a source of the Berry curvature and contribute to the anomalous Hall effect.