Toward Intrinsic Room-Temperature Ferromagnetism in Two-Dimensional Semiconductors

Huang, Chengxi; Feng, Junsheng; Wu, Fang; Ahmed, Dildar; Huang, Bing; Xiang, Hongjun; Deng, Kuan; Kan, Erjun

doi:10.1021/jacs.8b07879

Cited by 299 publications

(250 citation statements)

References 46 publications

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“…The ongoing research on emerging 2D ferromagnetic materials mainly follows two directions: (i) the pursuit of high‐performance vdW ferromagnets and (ii) the application of experimentally known vdW ferromagnets . The former aims to pursue new vdW ferromagnetic materials possessing superior properties, such as high‐mobility ferromagnetic semiconductors, half metals with large spin gaps, and robust ferromagnets with high Curie temperature . The latter focuses on the rational control of atom‐thick vdW ferromagnets to accomplish better performance in nanodevices, among which electrical control, via electric field and electrostatic doping, has been verified to be an effective strategy to modulate atomically thin vdW ferromagnets .…”

Section: Introductionmentioning

confidence: 99%

Nonvolatile Electrical Control and Heterointerface‐Induced Half‐Metallicity of 2D Ferromagnets

Zhao

Zhang

Yuan

et al. 2019

Adv Funct Materials

119

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Electrical control of atom-thick van der Waals (vdW) ferromagnets is a key toward future magnetoelectric nanodevices; however, state-of-the-art control approaches are volatile. In this work, introducing ferroelectric switching as an aided layer is demonstrated to be an effective approach toward achieving nonvolatile electrical control of 2D ferromagnets. For example, when a ferromagnetic monolayer CrI 3 and ferroelectric MXene Sc 2 CO 2 come together into multiferroic heterostructures, CrI 3 is controlled by polarized states P↑ and P↓ of Sc 2 CO 2 . P↑ Sc 2 CO 2 does not change the semiconducting nature of CrI 3 , but surprisingly P↓ Sc 2 CO 2 makes CrI 3 half-metallic. Nonvolatility of the electrical switching between two oppositely ferroelectric polarized states, therefore, indirectly enables nonvolatile electrical control of CrI 3 between ferromagnetic semiconductor and half-metal. The heterointerfaceinduced half-metallicity in CrI 3 is intrinsic without resorting to any chemical functionalization or external physical modification, which is rather beneficial to the practical application. This work paves the way for nonvolatile electrical control of 2D vdW ferromagnets and applications of CrI 3 in half-metal-based nanospintronics.

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Section: Introductionmentioning

confidence: 99%

Nonvolatile Electrical Control and Heterointerface‐Induced Half‐Metallicity of 2D Ferromagnets

Zhao

Zhang

Yuan

et al. 2019

Adv Funct Materials

119

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“…However, the harmonic and mean-field approximations in the spin-wave Hamiltonian and the corresponding magnetization introduce extra error bars. A few Monte Carlo (MC) simulations predicted Tc in a range between 50K and 96K, depending on their parameters and Hamiltonians [26,27]. Importantly, recent studies [28][29][30] not only show the reliability of MC simulations comparing with the random phase approximation, and further reveal direct relations between Tc and corresponding magnetic interaction strengths.…”

Section: Introductionmentioning

confidence: 99%

Curie temperature of emerging two-dimensional magnetic structures

Fei

Yang

2019

Phys. Rev. B

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Recent realizations of intrinsic, long-range magnetic orders in two-dimensional (2D) van der Waals materials have ignited tremendous research interests. In this work, we employ the XXZ Heisenberg model and Monte Carlo simulations to study a fundamental property of these emerging 2D magnetic materials, the Curie temperature (Tc). By including both onsite and neighbor couplings extracted from first-principles simulations, we have calculated Tc of monolayer chromium trihalides and Cr2Ge2Te6, which are of broad interests currently, and the simulation results agree with available measurements. We also clarify the roles played by anisotropic and isotropic interactions in deciding Tc of magnetic orders. Particularly, we find a universal, linear dependence between Tc and magnetic interactions within the parameter space of realistic materials.With this linear dependence, we can predict Tc of general 2D lattice structures, omitting the Monte Carlo simulations. Compared with the widely used Ising model, mean-field theory, and spin-wave theory, this work provides a convenient and quantitative estimation of Tc, giving hope to speeding up the search for novel 2D materials with higher Curie temperatures.

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“…Based on Monte Carlo (MC) simulations, 43 the T c of Cs 4 FePb 2 Cl 12 is estimated to be 442 K (Fig. 5d), which is well above RT and among the highest T c of intrinsic HMFs reported in the literatures.…”

Section: Origin Of Fm Ground-state In Cs 4 Fepb 2 CL 12mentioning

confidence: 89%

Prediction of room-temperature half-metallicity in layered halide double perovskites

et al. 2019

npj Comput Mater

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Half-metallic ferromagnets (HMFs) that possess intriguing physical properties with completely spin-polarized current are key candidates for high-efficiency spintronic devices. However, HMFs that could simultaneously have high Curie temperature (T c ), wide half-metallic gap (Δ HM ), and large bulk magnetocrystalline anisotropy energy (MAE) are very rare, which significantly restrict their room-temperature (RT) applications. In this article, through materials screening in layered halide double perovskites (LHDPs), we have theoretically identified that Cs 4 FePb 2 Cl 12 , which has good crystallographic, dynamic and thermal stabilities, possesses an intrinsic half-metallic ground-state with a high T c~4 50 K. Interestingly, the long-range ferromagnetic ordering in bulk Cs 4 FePb 2 Cl 12 is contributed by the strong super-superexchange interactions between the neighboring Fe d orbitals mediated by different anionic Cl p orbitals. The high T c of layered Cs 4 FePb 2 Cl 12 can be well maintained even in the monolayer limitation, i.e., T c~3 70 K for Cs 4 FePb 2 Cl 12 monolayer, which is critical for nanoscale device applications. Moreover, both bulk and monolayer Cs 4 FePb 2 Cl 12 can exhibit wide Δ HM~0 .55 eV and large MAE >320 μeV/Fe, comparable to that of the best HMFs reported in the literature. Our findings can significantly extend the potentials of LHDPs for high-temperature spintronic applications.npj Computational Materials (2019) 5:114 ; https://doi.

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Toward Intrinsic Room-Temperature Ferromagnetism in Two-Dimensional Semiconductors

Cited by 299 publications

References 46 publications

Nonvolatile Electrical Control and Heterointerface‐Induced Half‐Metallicity of 2D Ferromagnets

Nonvolatile Electrical Control and Heterointerface‐Induced Half‐Metallicity of 2D Ferromagnets

Curie temperature of emerging two-dimensional magnetic structures

Prediction of room-temperature half-metallicity in layered halide double perovskites

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