Nano Research

, Volume 10, Issue 6, pp 1972–1979 | Cite as

YN2 monolayer: Novel p-state Dirac half metal for high-speed spintronics

Research Article

Abstract

In spintronics, it is highly desirable to find new materials that can simultaneously possess complete spin-polarization, high-speed conduction electrons, large Curie temperature, and robust ferromagnetic ground states. Using first-principles calculations, we demonstrate that the stable YN2 monolayer with octahedral coordination is a novel p-state Dirac half metal (DHM), which not only has a fully spin-polarized Dirac state, but also the highest Fermi velocity (3.74 × 105 m/s) of the DHMs reported to date. In addition, its half-metallic gap of 1.53 eV is large enough to prevent the spin-flip transition. Because of the strong nonlocal p orbitals of N atoms (N-p) direct exchange interaction, the Curie temperature reaches over 332 K. Moreover, its ferromagnetic ground state can be well preserved under carrier doping or external strain. Therefore, the YN2 monolayer is a promising DHM for high-speed spintronic devices and would lead to new opportunities in designing other p-state DHMs.

Keywords

spintronics Dirac half metal YN2 monolayer ferromagnetism 

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YN2 monolayer: Novel p-state Dirac half metal for high-speed spintronics

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.School of Physical Science and TechnologyInner Mongolia UniversityHohhotChina
  2. 2.Beijing Computational Science Research CenterBeijingChina
  3. 3.Key Laboratory of Materials Modification by Laser, Ion and Electron BeamsDalian University of TechnologyDalianChina

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