Spin wave ballistic transport properties of [ Co 1- cGdc ] [ Co ] [ Co 1- cGdc ] nanojunctions between Co leads

V. Ashokan, A. Khater, M. Abou Ghantous, D. Ghader

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The spin wave (SW) ballistic transport properties are investigated for nanojunction systems composed of thin [Co1-cGdc][Co][Co1-cGdc] layered nanostructures between cobalt leads. The nanojunction is considered as a homogeneous random alloy of concentrations c on an hcp crystal lattice. corresponds to the numbers of the hcp (0001) atomic planes per given layer. The phase field matching theory (PFMT) is used to investigate the spin dynamics of the nanojunction system in the virtual crystal approximation (VCA), valid in particular for submicroscopic SW wavelengths. The model calculations yield the spin modes localized on the nanojunction, normal to its plane, in their propagating and resonant forms. The eigenvectors of these modes are calculated for certain cases to illustrate the spin precession configurations on the nanojunction. The VCA-PFMT approach yields a general model, and is used to calculate the SW ballistic scattering and transport across the nanojunction for spin waves incident from the Co leads onto the nanojunction. The results demonstrate resonance Fano assisted maxima in the SW transmission spectra due to interactions between incident lead spin waves and localized spin resonances on the nanojunction. It is shown that these maxima change with nanojunction thickness and alloy concentration. The spectral transmission results for low frequency SWs are of specific interest, in particular they correspond to submicroscopic wavelengths which present an interest for current research of magnonic devices.

Original languageEnglish
Pages (from-to)18-26
Number of pages9
JournalJournal of Magnetism and Magnetic Materials
Volume384
DOIs
Publication statusPublished - 15 Jun 2015
Externally publishedYes

Fingerprint

Spin waves
Ballistics
Transport properties
ballistics
magnons
transport properties
Spin dynamics
Wavelength
Crystals
spin resonance
Wave transmission
spin dynamics
Cobalt
approximation
precession
Eigenvalues and eigenfunctions
crystal lattices
Crystal lattices
wavelengths
crystals

Keywords

  • Ballistic transport
  • Ferrimagnetic nanojunctions
  • Phase field matching theory
  • Virtual crystal approximation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Spin wave ballistic transport properties of [ Co 1- cGdc ] [ Co ] [ Co 1- cGdc ] nanojunctions between Co leads. / Ashokan, V.; Khater, A.; Abou Ghantous, M.; Ghader, D.

In: Journal of Magnetism and Magnetic Materials, Vol. 384, 15.06.2015, p. 18-26.

Research output: Contribution to journalArticle

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AU - Ghader, D.

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AB - The spin wave (SW) ballistic transport properties are investigated for nanojunction systems composed of thin [Co1-cGdc]′[Co][Co1-cGdc]′ layered nanostructures between cobalt leads. The nanojunction is considered as a homogeneous random alloy of concentrations c on an hcp crystal lattice. corresponds to the numbers of the hcp (0001) atomic planes per given layer. The phase field matching theory (PFMT) is used to investigate the spin dynamics of the nanojunction system in the virtual crystal approximation (VCA), valid in particular for submicroscopic SW wavelengths. The model calculations yield the spin modes localized on the nanojunction, normal to its plane, in their propagating and resonant forms. The eigenvectors of these modes are calculated for certain cases to illustrate the spin precession configurations on the nanojunction. The VCA-PFMT approach yields a general model, and is used to calculate the SW ballistic scattering and transport across the nanojunction for spin waves incident from the Co leads onto the nanojunction. The results demonstrate resonance Fano assisted maxima in the SW transmission spectra due to interactions between incident lead spin waves and localized spin resonances on the nanojunction. It is shown that these maxima change with nanojunction thickness and alloy concentration. The spectral transmission results for low frequency SWs are of specific interest, in particular they correspond to submicroscopic wavelengths which present an interest for current research of magnonic devices.

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