Magnonic ballistic transport across Fe-Ni alloy nanojunctions between Fe/Co leads using Phase Field Matching and Ising Effective Field Theory approaches

Moujaes, Elie A.; Khater, A.; Ghantous, Michel Abou; Ashokan, Vinod

doi:10.1016/j.mtla.2018.10.012

Cited by 5 publications

(3 citation statements)

References 47 publications

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“…We adopt the semi-classical linear spin wave approach [53][54][55][56][57][58][59][60][61][62] to derive the momentum-space…”

Section: Bulk Momentum-space Hamiltonianmentioning

confidence: 99%

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Theoretical realization of rich magnon topology by symmetry-breaking in honeycomb bilayer ferromagnets

Ghader

2022

Physica E: Low-dimensional Systems and Nanostructures

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“…We adopt the semi-classical linear spin wave approach [53][54][55][56][57][58][59][60][61][62] to derive the momentum-space…”

Section: Bulk Momentum-space Hamiltonianmentioning

confidence: 99%

“…Holstein-Primakov approach yields identical results. The real space Hamiltonian can be expressed as The effective field acting on the 𝐴 1 −sublattice can be deduced from ℋ as [53][54][55][56][57][58][59]62]…”

Section: Bulk Momentum-space Hamiltonianmentioning

confidence: 99%

Theoretical realization of rich magnon topology by symmetry-breaking in honeycomb bilayer ferromagnets

Ghader

2022

Physica E: Low-dimensional Systems and Nanostructures

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“…Also, to the authors knowledge, there are no density functional theory (DFT) or first principle calculations for the cobalt-cobalt and cobalt-gadolinium exchange in the alloy layered [ℓ ′ ℓℓ ′ ] nanostructures. There is hence effectively a need for reliable data for the exchange and sublattice magnetizations in these systems to be able to develop modeling studies for the ...Co][ℓ ′ ℓℓ ′ ][Co... nanojunctions which are key elements for ballistic spin wave transport in magnonic devices [22,[25][26][27][28][29][30]. This need has motivated our EFT calculations to determine such data with no fitting parameters, using basic values S Co = 1 and S Gd = 7/2 as the spin references at absolute 0 K.…”

Section: Introductionmentioning

confidence: 99%

Computational modeling of sublattice magnetizations of nano-magnetic layered materials

Ashokan¹,

Khater²,

Ghantous³

2020

Preprint

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In the present work, we model the salient magnetic properties of the alloy layered ferrimagnetic nanostructuresbetween magnetically ordered cobalt leads. The effective field theory (EFT) Ising spin method is used to compute reliable J Co−Co and J Gd−Gd exchange values for the pure cobalt and gadolinium materials in comparison with experimental data. Using the combined EFT and mean field theory (MFT) spin methods, the sublattice magnetizations of the Co and Gd sites on the individual hcp basal planes of the layered nanostructures, are calculated and analyzed. The sublattice magnetizations, effective magnetic moments per site, and compensation characteristics on the individual hcp atomic planes of the embedded nanostructures are presented as a function of temperature and the thicknesses of the layered ferrimagnetic nanostructures, for different stable eutectic concentrations c ≤ 0.5. In the absence of first principles calculations for these basic physical variables for the layered nanostructures between cobalt leads, the combined EFT and MFT approach, and appropriate magnetic modeling of the well-defined interfaces of these systems, yield the only available information for them at present. These magnetic variables are necessary for spin dynamic computations, and for the ballistic magnon transport across embedded nanojunctions in magnonics. The model is general, and may applied directly to other composite magnetic elements and embedded nanostructures.

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The importance of long range Fe–Fe interactions in magnetically ordered 2D Fe0.2Ni0.8/Ni(001) and Fe0.3Ni0.7/Ni(001) alloy systems

Moujaes,

Khater

2024

Computational Materials Science

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Magnonic ballistic transport across Fe-Ni alloy nanojunctions between Fe/Co leads using Phase Field Matching and Ising Effective Field Theory approaches

Cited by 5 publications

References 47 publications

Theoretical realization of rich magnon topology by symmetry-breaking in honeycomb bilayer ferromagnets

Theoretical realization of rich magnon topology by symmetry-breaking in honeycomb bilayer ferromagnets

Computational modeling of sublattice magnetizations of nano-magnetic layered materials

The importance of long range Fe–Fe interactions in magnetically ordered 2D Fe0.2Ni0.8/Ni(001) and Fe0.3Ni0.7/Ni(001) alloy systems

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