The arise of nanoscale spintronics has arouse keen interest in intrinsic ferromagnetism in two-dimensional (2D) materials. The intensive searching for 2D ferromagnets has been mainly focused on the 3d/4d transition...
With the continuous miniaturization and integration of spintronic devices, two-dimensional (2D) ferromagnets coupling of ferromagnetic and diverse electrical properties, become more and more important. Here, we report three ferromagnetic monolayers,...
Two-dimensional (2D) ferromagnets with high Curie temperatures (T C ) and large perpendicular magnetic anisotropy (PMA) are rare, but have great potential in the field of spintronics. The present work investigates the electronic and magnetic properties of GdX (X = Cl and Br) monolayers and the two layers of GdCl/GdBr heterojunctions by conducting in-depth theoretical calculations. As expected, both GdCl and GdBr monolayers are ferromagnetic and have large magnetic moments of ∼8 μ B per Gd atom. Besides, they both show large PMA with magnetic anisotropy energies of 0.88 and 0.85 meV/unit cell and ultrahigh T C of 826 and 704 K, respectively. Significantly, they both have topological properties and spin-orbit-induced energy band reversion. In addition, we found two stable stacking configurations for the GdCl/GdBr bilayer heterojunction. The ultrahigh T C and topological properties are maintained in the two stacking configurations. Their easy magnetization axes shift from out-of-plane to in-plane directions as a result of the competition mainly between the Gd p and Gd d orbitals. These properties endow GdCl and GdBr monolayers with great potential for practical applications in the field of spintronic devices at the nanoscale.
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