Tang Cheng, Ostrikov Kostya Ken, Sanvito Stefano, Du Aijun
Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia.
Nanoscale Horiz. 2021 Jan 5;6(1):43-48. doi: 10.1039/d0nh00598c.
Two-dimensional (2D) magnets simultaneously possessing a high transition temperature and large perpendicular magnetic anisotropy are extremely rare, but essential for highly efficient spintronic applications. By using ab initio and global minimization approaches, we for the first time report a completely planar hypercoordinate metalloborophene (α-FeB3) with high stability, unusual stoichiometry and exceptional magnetoelectronic properties. The α-FeB3 monolayer exhibits room-temperature ferromagnetism (Tc = 480 K), whose origin is first revealed by the B-mediated RKKY interaction in the 2D regime. Its perpendicular magnetic anisotropy is almost six times larger than that of the experimentally realized 2D CrI3 and Fe3GeTe2. Moreover, metallic α-FeB3 shows n- and p-type Dirac transport with a high Fermi velocity in both spin channels. Our results not only highlight a promising 2D ferromagnet for advanced spintronics, but also pave the way for exploring novel 2D magnetism in boron-based magnetic allotropes.
同时具备高转变温度和大垂直磁各向异性的二维（2D）磁体极为罕见，但对于高效自旋电子学应用而言至关重要。通过使用从头算和全局最小化方法，我们首次报道了一种具有高稳定性、不寻常化学计量比和卓越磁电性能的完全平面超配位金属硼烯（α-FeB3）。α-FeB3单层表现出室温铁磁性（Tc = 480 K），其起源首次在二维体系中由硼介导的RKKY相互作用揭示。其垂直磁各向异性几乎比实验实现的二维CrI3和Fe3GeTe2大六倍。此外，金属性α-FeB3在两个自旋通道中均表现出具有高费米速度的n型和p型狄拉克输运。我们的结果不仅突出了一种用于先进自旋电子学的有前景的二维铁磁体，还为在硼基磁同素异形体中探索新型二维磁性铺平了道路。
