Robust Half-Metallicity and Perfect Spin Filtering in 2D oxide layer

ORAL

Abstract

We use first-principles calculations to demonstrate the transition metal oxide monolayer (ML) of Cr2O3 as an ideal candidate for next-generation spintronics applications. Cr2O3 ML has a honeycomb-kagome lattice that possesses the kagome band characteristics, where the Dirac and strongly correlated fermions coexist around the Fermi level. Furthermore, the classical Heisenberg Hamiltonian shows strong FM interactions between Cr spins, and the Cr3+ ions are in a low-spin state leading to a spin S = 3/2. Cr2O3 ML possesses a robust half-metallic behavior with a large spin gap of ~ 3.9 eV and a high TC = 190 K. We also find that Cr2O3 ML displays an intrinsic Ising ferromagnetism with a giant PMAE of ~ 0.9 meV. More importantly, NEGF calculations reveal that the Cr2O3 ML exhibits an excellent spin filtering effect.

*This research was partially supported by MEXT as a social and scientific priority issue (Creation of new functional devices and high-performance materials to support next generation industries) to be tackled by using post-K computer, JSPS KAKENHI Grant No. 19K15381, and JSPS Core-to-Core program (Controlled Interfacing of 2D materials for Integrated Device Technology).

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Presenters

  • Arqum Hashmi

    • Center for Computational Sciences, University of Tsukuba, Japan

Authors

  • Arqum Hashmi

    • Center for Computational Sciences, University of Tsukuba, Japan

  • Kenta Nakanishi

    • Graduate School of Pure and Applied Sciences, University of Tsukuba, Japan

  • Muhammad Umar Farooq

    • Department of Physics, Southern University of Science and Technology, Shenzhen, China

  • Tomoya Ono

    • Department of Electrical and Electronic Engineering, Kobe University, Japan