Two-dimensional magnetic materials: structures, properties and external controls

Zhang, Shuqing; Xu, Runzhang; Luo, Nannan; Zou, Xiaolong

doi:10.1039/d0nr06813f

Cited by 91 publications

(68 citation statements)

References 162 publications

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“…In past few years, the experimental discovery of intrinsic magnetism in 2D layers of CrI 3 , [1] Cr 2 Ge 2 Te 6 , [2] and Fe 3 GeTe 2 [3] has aroused great interest in 2D magnetic materials. [4][5][6][7][8][9] Among them, ferromagnetic (FM) half-metals, behaving as a metal in one spin channel and a semiconductor or insulator in the other, are one class of ideal materials for the generation and injection of spin carriers, and the long-distance transport [10][11][12] due to their 100% spin polarization. However, the FM ground state in most of the discovered half-metallic materials is usually unstable at ambient temperature, which greatly hinders their practical applications.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it is important to synthesize or design the desirable 2D halfmetals with robust FM ground state under high temperature. [7,8] At present, more and more room-temperature 2D FM half-metals have been proposed in theory, such as MnNF (890 K), [13] Fe 2 Si (780 K), [14] Co 2 Se 3 (600 K), [15] CoGa 2 Se 4 (516 K) and CoGa 2 Te 4 (570 K), [16] 1T-TaN 2 (%339 K), [17] 1T-YN 2 (%332 K), [18] MnP (495 K), [19] Cr 2 C (562 K), [20] and so on.…”

Section: Introductionmentioning

confidence: 99%

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MnNBr Monolayer: A High‐Temperature Ferromagnetic Half‐Metal with Type‐II Weyl Fermions

Shi

Cui

Song

et al. 2021

Physica Rapid Research Ltrs

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For spintronics, it is highly desirable to obtain stable low‐dimensional materials with ferromagnetic ground state, 100% spin polarization, and high Curie temperature. Moreover, type‐II Weyl fermions are also desired for realizing high‐speed anisotropic transport. Herein, based on first‐principles calculations, the orthorhombic MnNBr monolayer is identified as a needed ferromagnetic half‐metal, which not only has a high Curie temperature (910 K), but also holds type‐II Weyl state with Lorentz symmetry broken. Analysis of the stability reveals that the MnNBr monolayer is energetically, mechanically, dynamically, and thermally stable. Remarkably, in the vicinity of the Fermi level there exist both type‐I and titled type‐II Weyl states, whose nodes form continuously distributed Weyl loops. Under intrinsic out‐of‐plane magnetization, they are robust against spin–orbital coupling due to the protection of glide mirror symmetry. Moreover, near the type‐II Weyl point, there is direction‐dependent band dispersion: the largest fermion velocities can be found in the k path of G–X (up to 6.86 × 105 m s−1), while quasi‐flat bands with negligible band dispersion can be found along the direction being parallel to G–Y. This indicates that MnNBr monolayer should be a promising candidate for further applications of high‐speed anisotropic transport and studies of strongly correlated electronic states.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MnNBr Monolayer: A High‐Temperature Ferromagnetic Half‐Metal with Type‐II Weyl Fermions

Shi

Cui

Song

et al. 2021

Physica Rapid Research Ltrs

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“…This free‐standing 2D magnet leads to a wealth of interesting properties, such as particularly high mobility and remarkable linear dichroism, [ 15 ] which makes them promising candidates for various spintronic applications. Furthermore, due to the atomic‐scale thickness, vdW magnets are susceptible to external stimuli, such as external electric field, mechanical constraints, defects, and twist, [ 16–18 ] exhibiting a sound tunability in physical properties.…”

Section: Introductionmentioning

confidence: 99%

Alloy Engineering of 2D Van der Waals Chromium Mixed Trihalides as Ferromagnetic Semiconductors

Chen

Wang

Yuan

et al. 2021

Physica Status Solidi (b)

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The electronic and magnetic properties of 2D‐layered chromium mixed trihalide CrXY2 (XY = IBr, ICl, BrCl) and W‐alloyed chromium mixed trihalide CrWX2Y4 monolayers are investigated by employing the combination of density functional theory and Monte Carlo (MC) simulation. The dynamical stability, the possibility of formation, and the structural stability of these pristine and alloyed chromium mixed trihalide monolayers are verified by the phonon spectra, the negative formation enthalpies, and the negative cohesive energies, respectively. All of them are intrinsic ferromagnetic (FM) semiconductors with the easy axis along z while along x for CrICl2 monolayer. The Curie temperatures ( T normalC ) of pristine chromium mixed trihalide monolayers are estimated to be 40–70 K by the MC simulations. FM ordering of alloy compound CrWX2Y4 monolayers is largely enhanced up to T normalC ∼ 170 K. Thus, alloy engineering can be a route to the room temperature FM semiconductors.

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“…The discovery of ferromagnetic two-dimensional (2D) materials such as CrI 3 [1][2][3][4][5], CrBr 3 [6,7], CrGeTe 3 [8,9] and other [10][11][12], has spurred tremendous interest in controlling 2D magnetism by electric field, strain and defects. Ferromagnetism in 2D materials is highly desirable for new technological applications such as nanoscale spintronics where the electron's spin degree of freedom is used to carry information [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Pivotal role of magnetic ordering and strain in lattice thermal conductivity of chromium-trihalide monolayers

Pandey¹,

Peeters²,

Milovsevic³

2021

Preprint

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Understanding the coupling between spin and phonons is critical for controlling the lattice thermal conductivity (κ l ) in magnetic materials, as we demonstrate here for CrX3 (X = Br and I) monolayers. We show that these compounds exhibit large spin-phonon coupling (SPC), dominated by out-ofplane vibrations of Cr atoms, resulting in significantly different phonon dispersions in ferromagnetic (FM) and paramagnetic (PM) phases. Lattice thermal conductivity calculations provide additional evidence for strong SPC, where particularly large κ l is found for the FM phase. Most strikingly, PM and FM phases exhibit radically different behavior with tensile strain, where κ l increases with strain for the PM phase, and strongly decreases for the FM phase -as we explain through analysis of phonon lifetimes and scattering rates. Taken all together, we uncover the very high significance of SPC on the phonon transport in CrX3 monolayers, a result extendable to other 2D magnetic materials, that will be useful in further design of thermal spin devices.

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Two-dimensional magnetic materials: structures, properties and external controls

Abstract: This article reviewed the structures, properties and external controls of 2D magnets.

Cited by 91 publications

References 162 publications

MnNBr Monolayer: A High‐Temperature Ferromagnetic Half‐Metal with Type‐II Weyl Fermions

MnNBr Monolayer: A High‐Temperature Ferromagnetic Half‐Metal with Type‐II Weyl Fermions

Alloy Engineering of 2D Van der Waals Chromium Mixed Trihalides as Ferromagnetic Semiconductors

Pivotal role of magnetic ordering and strain in lattice thermal conductivity of chromium-trihalide monolayers

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