Exotic spintronic properties of transition-metal monolayers on graphyne

Abstract

The recent discovery of two-dimensional (2D) magnetic materials which are compound of transition metal (TM) with other elements, has opened new avenues for basic research on low-dimensional magnetism and potential applications in spintronics. To further explore new 2D magnets of pure TM is thus of an interesting topic. Based on the first-principles calculations, here we propose a strategy of obtaining monolayer TM magnets, i.e., depositing TM atoms on graphyne (Gy) which has proper hexagonal hollow geometry. We find that TM monolayer with perfect hexagonal geometry can be formed on Gy. The TM monolayer exhibits a wealth of physical properties in dependence of TM species, such as ferromagnetic and antiferromagnetic ground states, as well as intriguing semimetal and half-metal characteristics. We also find that the half-metal characteristics makes the monolayer TM have great potential applications in the horizontal magnetic tunnel junction (MTJ) devices, where the tunneling magnetoresistance can reach as high as 850000%. Our results provide a new framework for obtaining 2D magnets with outstanding spintronic properties.

16 pages, 5 figures

References in corpus (11)

• Electric Field Effect in Atomically Thin Carbon Films
• Half-Metallic Graphene Nanoribbons
• Graphene Spintronics
• Magnetism in Graphene Induced by Single-Atom Defects
• Hydrogen on graphene: Electronic structure, total energy, structural distortions, and magnetism from first-principles calculations
• Magnetic Correlations at Graphene Edges
• Room-temperature ferromagnetism in graphite driven by 2D networks of point defects
• Magnetic Moment Formation in Graphene Detected by Scattering of Pure Spin Currents
• Low density ferromagnetism in biased bilayer graphene
• Topological Dirac states beyond $\pi$ orbitals for silicene on SiC(0001) surface
• Fully spin-polarized quadratic non-Dirac bands realized quantum anomalous Hall effect