Tunable two dimensional ferromagnetic topological half-metal CrO2 by electronic correction and spin direction

Abstract

Spintronics is one of the most promising information technologies now, especially for nontrivial topological Dirac half-metal, which exhibits extraordinary electronic band and transport properties. In this work, we propose that 1T-CrO2 nanosheet is mechanical stable, large spin-gap, and room temperature ferromagnetic Dirac half metal. It also exhibits a desirable giant magneto band structure effect, and when the spin direction is switched from in-plane to out-of-plane with a spin orbital coupling effect, it will exhibit nontrivial topological phase transition. The topological tunable electronic band property makes it a very promising two-dimensional nanosheet for spintronics.

Novel two-dimensional ferromagnetic materials CrX2 (X = O, S, Se) with high Curie temperature

“…Nonetheless, the experimental breakthrough of 2D ferromagnets stirred up intense experimental and theoretical exploration for 2D materials with high Curie temperature ( T C ). 14–21…”

Above-room Curie temperature and barrier-layer-dependent tunneling magnetoresistance in 1T-CrO2 monolayer based magnetic tunnel junctions

“…Electron correlation for Cr-atom's d orbitals is taken into account by the GGA+U method, 44 and Hubbard on-site Coulomb correction (U) is set at 2.0 eV. 38,39 We set the cutoff energy at 500 eV for calculations. A 15 Â 15 Â 1 Gamma-centered grid is adopted to sample the Brillouin zone (BZ).…”

“…Thus, the 1T-CrO 2 monolayer presents an in-plane magnetic anisotropy, which is in agreement with the previous conclusion. 38,39 In addition, we have investigated the MAE of the 1T-CrO 2 monolayer under different electrical fields which are along the direction perpendicular to the surface of the monolayer. The calculated results are listed in Table 1.…”

“…37 The 2D HMF monolayer with high T c is the most promising one for constructing vdW-MTJs. Encouragingly, several research groups reported that the 1T-CrO 2 monolayer is a mechanically stable HMF with a large spin gap and room-temperature ferromagnetic ordering, 38,39 which indicates the superiority of being a ferromagnetic layer in vdW-MTJs. What remains to be determined is the choice of an appropriate barrier layer.…”

Thickness-Dependent Magnetism and Topological Properties of EuSn2As2

“…The materials with magnetic and topological nontrivial bands can give rise to many forefront electronic states, such as magnetic Weyl/Dirac semi-metals, , high-order topological insulators (TIs), and antiferromagnetic (AFM) TIs. , These novel electronic states have promising applications for designing next-generation spintronic devices so that it motivates enormous interest searching for more intrinsically magnetic topological materials. − Recently, several materials, including the MnBi 2 Te 4 family, Mn 3 X (X = Sn, Ge, Ir), Co 2 YZ (Y = V, Zr, Nb, Ti, Hf; Z = Si, Ge, Sn), Co 3 Sn 2 S 2 , and so on, have been verified to exhibit a fascinating magnetic topological state. Their magnetic topological phase can be further tuned by various of manipulation techniques, e.g., rotating the magnetic moment orientation, − doping, strain, dimensional tuning, etc. Hence, the discovery of the intrinsic magnetic topological materials and effective manipulation of their magnetic topological phase are crucial for achieving exotic magnetic topological quantum phenomena.…”