Theory, properties and engineering of 2D magnetic materials

Xing, Shucheng; Zhou, Jian; Zhang, Xuanguang; Elliott, S. R.; Sun, Zhimei

doi:10.1016/j.pmatsci.2022.101036

Cited by 39 publications

(34 citation statements)

References 347 publications

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“…[24] These features make CrGT a promising candidate for future spintronic and nanoelectronic applications in low dimensions. [25] However, CrGT can readily lose its long-range structural order in nanoscale electronic devices: a moderate voltage pulse of 3 V over 100 ns is already sufficient to trigger amorphization of CrGT, [26] which would significantly alter its magnetic properties. By applying a weaker pulse of 1.6 V over 30 ns, amorphous CrGT can be crystallized again.…”

Section: Introductionmentioning

confidence: 99%

Spin Glass Behavior in Amorphous Cr₂Ge₂Te₆ Phase‐Change Alloy

et al. 2023

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The layered crystal structure of Cr2Ge2Te6 shows ferromagnetic ordering at the two‐dimensional limit, which holds promise for spintronic applications. However, external voltage pulses can trigger amorphization of the material in nanoscale electronic devices, and it is unclear whether the loss of structural ordering leads to a change in magnetic properties. Here, it is demonstrated that Cr2Ge2Te6 preserves the spin‐polarized nature in the amorphous phase, but undergoes a magnetic transition to a spin glass state below 20 K. Quantum‐mechanical computations reveal the microscopic origin of this transition in spin configuration: it is due to strong distortions of the CrTeCr bonds, connecting chromium‐centered octahedra, and to the overall increase in disorder upon amorphization. The tunable magnetic properties of Cr2Ge2Te6 can be exploited for multifunctional, magnetic phase‐change devices that switch between crystalline and amorphous states.

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Section: Introductionmentioning

confidence: 99%

Spin Glass Behavior in Amorphous Cr₂Ge₂Te₆ Phase‐Change Alloy

et al. 2023

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“…This configuration has been recently implemented in a dice lattice [34] and experimentally in a honeycomb magnon lattice [35] to explore the topological properties and phase transitions of such systems. See also [36] for a recent review.…”

Section: Lieb Lattice and Pseudospin-1 Dirac Equationmentioning

confidence: 99%

Lieb lattices and pseudospin-1 dynamics under barrier- and well-like electrostatic interactions

Jakubský¹,

Zelaya²

2023

Preprint

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This work considers the confining and scattering phenomena of electrons in a Lieb lattice subjected to the influence of a rectangular electrostatic barrier. In this setup, hopping amplitudes between nearest neighbors in orthogonal directions are considered different, and the next-nearest neighbor interaction describes spin-orbit coupling. This makes it possible to confine electrons and generate bound states, the exact number of which is exactly determined for null momentum parallel to the barrier. In such a case, it is proved that one even and one odd bound state is always generated, and the number of bound states increases for nonnull and increasing values of the parallel momentum. That is, current-carrying states are generated. In the scattering regime, the energies are determined so that resonant tunneling occurs. The existence of perfect tunneling energy in the form of super-Klein tunneling is proved to exist regardless of the bang gap opening. Finally, it is shown that perfect reflection appears when solutions are coupled to the intermediate flat-band solution.

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“…Spintronic devices have attracted widespread attention because of their advantages of faster processing speed, ultralow heat dissipation, denser storage density, lower power consumption, and non-volatility. [1][2][3][4][5] With the need for the miniaturization of spintronic devices, intrinsic two-dimensional (2D) ferromagnetic semiconductor (FMS) materials are the most promising candidates for nanoscale spintronics, which can fulfill the demand of independent control of charge and spin. [6][7][8] The Mermin-Wagner theorem shows that no 2D longrange isotropic ferromagnetism would exist with continuous spin symmetries at finite temperatures.…”

Section: Introductionmentioning

confidence: 99%