Exotic Spintronic Properties of Transition‐Metal Monolayers on Graphyne

Abstract

The recent discovery of 2D magnetic materials, which are compounds of transition metals (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 an interesting topic. Based on the first‐principles calculations, here a strategy of obtaining monolayer TM magnets, i.e., depositing TM atoms on graphyne (Gy), which has proper hexagonal hollow geometry, is proposed. It is found that a 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 anti‐ferromagnetic ground states, as well as intriguing semimetal and half‐metal characteristics. It is also found that the half‐metal characteristics make the monolayer TM have great potential applications in horizontal magnetic tunnel junction (MTJ) devices, where the tunneling magnetoresistance can reach as high as 850 000%. These results provide a new framework for obtaining 2D magnets with outstanding spintronic properties.

Environmental applications of single-atom catalysts based on graphdiyne

“…[47][48][49] According to the polymerization method and the number of acetylene bonds in its phenyl ring, different configurations of graphyne can be formed including GDY, α-graphyne, β-graphyne and γ-graphyne, which have potential applications in the fields of superconductivity, electronics, energy, catalysis and biomedicine. 50 Meanwhile, due to the inherent adjustable bandgap of graphyne, it is widely used in the manufacture of flexible and wearable electronic devices, 51,52 including optoelectronic devices, 53 spintronic components, 54,55 and semiconductors. 56,57 In 2012, the magnetism of transition metal-modified graphyne was firstly studied via density functional theory (DFT) + U calculation, and the electron correlation was described using the linear response method.…”

Designing spintronic devices in two-dimensional γ-graphyne: from ultrafast spin dynamics to logic applications

“…Many graphene-like 2D structures, proposed both theoretically and experimentally, are widely considered to push the boundaries of low-dimensional carbon materials due to their unique electronic properties and structural diversity [22][23][24][25][26][27]. Among these, graphyne, consisting of both sp and sp 2 hybridized carbon atoms, emerges as a particularly promising candidate for developing spintronics, due to its excellent electronic properties and the flexibility offered by varying acetylene linkages between carbon hexagonal rings [28][29][30][31][32]. Such unique carbon allotropes, differing from graphene in its atomic arrangement and bonding, lead to new possibilities not only for structural design but also for spin manipulation [33].…”