Spin dynamics across an inhomogeneous atomic boundary separating ultrathin Heisenberg ferromagnetic films

M. Belhadi, R. Chadli, A. Khater, M. Abou Ghantous

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A theoretical model is presented for the study of the scattering and the localisation of spinwaves at an extended inhomogeneous structural and magnetic boundary separating ultrathin Heisenberg ferromagnetic films. The model system consists of two different magnetic materials A and B with different thickness of two and three atomic layers, on either side of a defect atomic step. The matching technique is used with nearest neighbour magnetic exchange to analyse both the localisation and the scattering spin dynamics. The localised spin states that manifest themselves as Rayleigh branches, and the local densities of spin states are calculated on this boundary. The coherent reflection and transmission scattering properties of spin-waves incident from the interior of the ultrathin films on the inhomogeneous boundary are also calculated. The numerical calculations are applied in particular to a system of three Fe ferromagnetic atomic layers and two Gd ferromagnetic atomic layers, across a defect atomic step. The results illustrate the occurrence of Fano resonances in the transmitted spectra due to the localised spin states on the inhomogeneous boundary. An interesting physical effect is observed for this magnetic and atomic step boundary, namely the frequency selective conductance of the spin-waves via Fano resonances, by an appropriate choice of the angle of spin-wave incidence on the boundary.

Original languageEnglish
Pages (from-to)25-31
Number of pages7
JournalEPJ Applied Physics
Volume37
Issue number1
DOIs
Publication statusPublished - Jan 2007
Externally publishedYes

Fingerprint

Spin dynamics
Spin waves
ferromagnetic films
spin dynamics
Scattering
magnons
Defects
Ultrathin films
Wave transmission
Magnetic materials
scattering
defects
magnetic materials
incidence
occurrences

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Spin dynamics across an inhomogeneous atomic boundary separating ultrathin Heisenberg ferromagnetic films. / Belhadi, M.; Chadli, R.; Khater, A.; Abou Ghantous, M.

In: EPJ Applied Physics, Vol. 37, No. 1, 01.2007, p. 25-31.

Research output: Contribution to journalArticle

Belhadi, M. ; Chadli, R. ; Khater, A. ; Abou Ghantous, M. / Spin dynamics across an inhomogeneous atomic boundary separating ultrathin Heisenberg ferromagnetic films. In: EPJ Applied Physics. 2007 ; Vol. 37, No. 1. pp. 25-31.
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