Collective spin excitations in 2D paramagnet with dipole interaction

Tsiberkin, Kirill

doi:10.1140/epjb/e2016-60964-2

Cited by 8 publications

(4 citation statements)

References 26 publications

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“…These exchange interactions are responsible for the antiferromagnetic alignment of magnetic cations in pristine MnTe. In the absence of strong exchange interactions, the only interactions that remain in MnTe sheets are dipolar in nature . Due to the very weak nature of these dipolar interactions, the magnetic moments are oriented randomly even at low temperatures resulting in a paramagnetic behavior.…”

Section: Resultsmentioning

confidence: 99%

“…In the absence of strong exchange interactions, the only interactions that remain in MnTe sheets are dipolar in nature. 42 Due to the very weak nature of these dipolar interactions, the magnetic moments are oriented randomly even at low temperatures resulting in a paramagnetic behavior. A sharp enhancement in magnetization at very low Pristine MnTe shows antiferromagnetic behavior with an observed anomalous behavior below 87 K (see Figure 4b).…”

Section: Acs Applied Nano Materialsmentioning

confidence: 99%

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Magnetic Properties and Photocatalytic Applications of 2D Sheets of Nonlayered Manganese Telluride by Liquid Exfoliation

Balan¹,

Radhakrishnan

Neupane

et al. 2018

ACS Appl. Nano Mater.

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Metal tellurides are highly sought after for energy and spintronic applications much of which is owed to its catalytic and magnetic properties. Confining it into twodimensions and improving the surface area enriches its catalytic activity and magnetic properties. Herein, we demonstrate the isolation of ultrathin two-dimensional sheets of manganese(II)telluride having an average thickness of ∼2 nm and flake size of ∼100 nm by means of liquid phase exfoliation presumably for the first time. Vanishing of exchange interactions in two-dimensions results in paramagnetic ordering in manganese(II)telluride sheets while its pristine form prefers antiferromagnetic order. The exfoliated two-dimensional sheets were used to sensitize titania nanotubes to broaden the absorption spectrum and utilize visible light for photoelectrochemical water splitting.

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Section: Resultsmentioning

confidence: 99%

Section: Acs Applied Nano Materialsmentioning

confidence: 99%

Magnetic Properties and Photocatalytic Applications of 2D Sheets of Nonlayered Manganese Telluride by Liquid Exfoliation

Balan¹,

Radhakrishnan

Neupane

et al. 2018

ACS Appl. Nano Mater.

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“…The recent emergence of Dirac magnetic materials [22][23][24][25][26][27][28][29][30][31][32][33][34] turned the attention towards edge magnetic excitations as an interesting novel fundamental phenomenon with important potentials for technological applications [35][36][37][38]. Edge spin waves (or magnons) in 2D honeycomb bounded magnetic system with various edge types have been intensively investigated using quantum approaches, notably the Holstein-Primakov formalism [39][40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Discretized dynamics of exchange spin wave bulk and edge modes in honeycomb nanoribbons with armchair edge boundaries

Ghader

Khater

2019

J. Phys.: Condens. Matter

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We develop a field theory to study the dynamics of long wavelength exchange spin wave excitations on honeycomb nanoribbons characterized by armchair edge boundaries and the Néel antiferromagnetic ordering state. Appropriate boundary conditions are established by requiring that the bulk and edge spins precess with the same frequency for any given spin wave eigenmode in these systems. A set of characteristic boundary equations, common for bulk and edge spin wave modes, are hence derived. The equations of motion for the spin dynamics are then solved to determine the propagating and evanescent exchange spin wave modes. We prove in general that the bulk spin wave dynamics is discretized due to the finite width of the nanoribbon. For an isotropic magnetic nanoribbon, the Dirac cone is reduced to a single linear dispersion curve due to this discretization. The number and wavelengths of allowed bulk modes for isotropic and anisotropic nanoribbons are determined from the derived characteristic boundary equations. As witnessed by our numerical results for different examples it is shown that the characteristics of these modes depend on the width of the nanoribbon and its antiferromagnetic anisotropy. Further, anisotropic nanoribbons, even those with the slightest anisotropy, present evanescent modes with non-linear dispersion relations. The spatial variation of the amplitudes of the evanescent exchange spin waves across the finite widths of the nanoribbons, is found to be strongly dependent on the system magnetic anisotropy and its width. The developed theoretical approach is general and can be applied for nanoribbons with all types of boundary edges.

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“…Such a situation can be realized when the spin subsystem isolated from the lattice is closer to the a e-mail: kbtsiberkin@psu.ru saturation state in a strong external magnetic field [11,12]. At a low lattice temperature, collective processes in spin system become possible for which the quantum spin wave approach used in ferromagnetism theory [10,13] can be applied.…”

Section: Introductionmentioning

confidence: 99%

Simulation of free induction decay at low-temperature with spin waves and classical spins

2019

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Collective spin excitations in 2D paramagnet with dipole interaction

Cited by 8 publications

References 26 publications

Magnetic Properties and Photocatalytic Applications of 2D Sheets of Nonlayered Manganese Telluride by Liquid Exfoliation

Magnetic Properties and Photocatalytic Applications of 2D Sheets of Nonlayered Manganese Telluride by Liquid Exfoliation

Discretized dynamics of exchange spin wave bulk and edge modes in honeycomb nanoribbons with armchair edge boundaries

Simulation of free induction decay at low-temperature with spin waves and classical spins

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