Berezinskii-Kosterlitz-Thouless phase transition in a 2D-XY ferromagnetic monolayer

Wang, Jiesu

doi:10.1088/1674-4926/42/12/120401

Cited by 3 publications

(6 citation statements)

References 17 publications

(21 reference statements)

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“…11] 43. Meanwhile, the T BKT is also consistent with aforementioned rough estimation of T BKT based on the model of enormalization-group 46. Thus, the estimation of T BKT is reliable.…”

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confidence: 72%

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2D-XY ferromagnetism with high transition temperature in Janus monolayer V$_{2}$XN (X = P, As)

Wan¹,

Fu²,

Liu³

et al. 2022

Preprint

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Two-dimensional (2D) magnetic materials with easy-plane anisotropy support the transport of electron spins without dissipation of energy, which is highly desirable for 2D spintronic devices. But intrinsic 2D easy-plane magnets are scarce. Here, we systematically investigated the structural and magnetic properties of Janus V 2 XN (X = P, As) monolayers by first-principles calculations. Janus V 2 XN monolayers adopted a 2D square crystal, exhibited half-metallic characters and had an easy magnetization xy-plane. The magnetic anisotropy energies (MAEs) are 58.8 and 230.8 µeV per V atom for V 2 PN and V 2 AsN, respectively. Through Monte Carlo simulations based on the XXZ model, Janus V 2 XN exhibited a Berezinskii-Kosterlitz-Thouless (BKT) phase transition with the emergence of magnetic vortices and antivortices. We estimated the transition temperature T BKT as 395 K and 434 K for monolayer V 2 PN and V 2 AsN, respectively, by fitting the in-plane susceptibility to the forms of the BKT theory. Meanwhile, T BKT can be effectively increased to above 500 K by tensile strain. Our study indicated that Janus monolayer V 2 XN were promising candidate materials to realize 2D easy-plane magnetism for spintronics applications.

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“…11] 43. Meanwhile, the T BKT is also consistent with aforementioned rough estimation of T BKT based on the model of enormalization-group 46. Thus, the estimation of T BKT is reliable.…”

supporting

confidence: 72%

“…43 Meanwhile, the T BKT is also consistent with aforementioned rough estimation of T BKT based on the model of enormalization-group. 46 Thus, the estimation of T BKT is reliable. The electronic and magnetic properties of monolayer V 2 PAs are similar to that of monolayer V 2 PN, except that the former has a larger SOC effect and MAE.…”

Section: Resultsmentioning

confidence: 98%

2D-XY ferromagnetism with high transition temperature in Janus monolayer V$_{2}$XN (X = P, As)

Wan¹,

Fu²,

Liu³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…54 Meanwhile, the T BKT is also consistent with the aforementioned rough estimation of T BKT by the renormalization-group calculations (see eqn (8)). 8 Thus, the estimation of T BKT is reliable.…”

Section: Resultsmentioning

confidence: 98%

“…7 The material realization of 2D-XY ferromagnets with a high transition temperature (T BKT ) is a fast-developing field and remains a challenge. 8 2D-XY ferromagnetism has been investigated in 2D hexagonal systems. In the experiment, Tokmachev et al observed that a sub-monolayer of Eu atoms self-assembled on surfaces of silicon, 9 graphene, 10 silicene, 11 and germanene 12 exhibits an easy magnetization plane.…”

Section: Introductionmentioning

confidence: 99%

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Two-dimensional XY ferromagnetism above room temperature in Janus monolayer V₂XN (X = P, As)

Wan

Liu

et al. 2023

Phys. Chem. Chem. Phys.

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Janus V₂AsP monolayer : a ferromagnetic semiconductor with a narrow band gap, a high Curie temperature and controllable magnetic anisotropy

Wan

Zhao

et al. 2022

J. Phys.: Condens. Matter

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The search and design of two-dimensional (2D) magnetic semiconductors for spintronics applications are particularly signiﬁcant. In this work, we investigated the electronic and magnetic properties of Janus structure based on Dirac half-metallic VP monolayer by ﬁrst-principles calculations. Due to the vertical symmetry breaking, Janus V2AsP monolayer becomes an intrinsic ferromagnetic semiconductor with a narrow band gap of 0.21 eV. We analyzed the electronic structure and origin of the in-plane easy axis in Janus V2AsP. The electron eﬀective mass is anisotropic and only 0.129 m0 along the x-direction. The Curie temperature Tc and magnetic anisotropy energy (MAE) of Janus V2AsP reach 490 K and 178 µeV per V atom, respectively. A uniaxial tensile stain εx of 5% can increase its band gap and MAE to 0.39 eV and 210.6 µeV per V atom while maintaining its Tc being above room temperature. Moreover, the direction of the easy axis can be changed between the in-plane x- and y-direction by a small uniaxial tensile strain εx of 2%. Our study can motivate further research on the design the magnetic semiconductors in Janus structures based on 2D Dirac half-metals for spintronics applications.

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Berezinskii-Kosterlitz-Thouless phase transition in a 2D-XY ferromagnetic monolayer

Abstract: Abstract

Cited by 3 publications

References 17 publications

2D-XY ferromagnetism with high transition temperature in Janus monolayer V$_{2}$XN (X = P, As)

2D-XY ferromagnetism with high transition temperature in Janus monolayer V$_{2}$XN (X = P, As)

Two-dimensional XY ferromagnetism above room temperature in Janus monolayer V₂XN (X = P, As)

Janus V₂AsP monolayer : a ferromagnetic semiconductor with a narrow band gap, a high Curie temperature and controllable magnetic anisotropy

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Berezinskii-Kosterlitz-Thouless phase transition in a 2D-XY ferromagnetic monolayer

Abstract: Abstract

Cited by 3 publications

References 17 publications

2D-XY ferromagnetism with high transition temperature in Janus monolayer V$_{2}$XN (X = P, As)

2D-XY ferromagnetism with high transition temperature in Janus monolayer V$_{2}$XN (X = P, As)

Two-dimensional XY ferromagnetism above room temperature in Janus monolayer V2XN (X = P, As)

Janus V2AsP monolayer : a ferromagnetic semiconductor with a narrow band gap, a high Curie temperature and controllable magnetic anisotropy

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Product

Resources

About

Two-dimensional XY ferromagnetism above room temperature in Janus monolayer V₂XN (X = P, As)

Janus V₂AsP monolayer : a ferromagnetic semiconductor with a narrow band gap, a high Curie temperature and controllable magnetic anisotropy