### 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 language | English |
---|---|

Pages (from-to) | 25-31 |

Number of pages | 7 |

Journal | EPJ Applied Physics |

Volume | 37 |

Issue number | 1 |

DOIs | |

Publication status | Published - Jan 2007 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)

### Cite this

*EPJ Applied Physics*,

*37*(1), 25-31. https://doi.org/10.1051/epjap:2006124

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

Research output: Contribution to journal › Article

*EPJ Applied Physics*, vol. 37, no. 1, pp. 25-31. https://doi.org/10.1051/epjap:2006124

}

TY - JOUR

T1 - Spin dynamics across an inhomogeneous atomic boundary separating ultrathin Heisenberg ferromagnetic films

AU - Belhadi, M.

AU - Chadli, R.

AU - Khater, A.

AU - Abou Ghantous, M.

PY - 2007/1

Y1 - 2007/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=33847225892&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847225892&partnerID=8YFLogxK

U2 - 10.1051/epjap:2006124

DO - 10.1051/epjap:2006124

M3 - Article

VL - 37

SP - 25

EP - 31

JO - EPJ Applied Physics

JF - EPJ Applied Physics

SN - 1286-0042

IS - 1

ER -