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Green’s functions theory for an interstitial magnetic impurity in a transverse Ising ferromagnet

Author

Listed:
  • M. M. Freire

    (Universidade Federal do Ceará, Campus Crateús, 63700-000 Crateús, Ceará, Brazil)

  • Raimundo N. Costa Filho

    (#x2020;Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, Campus do Pici, 60455-760 Fortaleza, Ceará, Brazil)

  • R. V. Leite

    (Centro de Ciências Exatas e Tecnologia, Curso de Física, Universidade Estadual Vale do Acaraú, Av. Dr. Guarany 317, Campus Cidao, 62040-730, Sobral, Ceará, Brazil)

Abstract

A Green’s function formalism is used to calculate the spectrum of localized states associated with an interstitial magnetic impurity in a semi-infinite ferromagnet described by the transverse Ising model. The nonresonant and resonant excitations of the system due to the impurity (i.e. the defect modes outside and inside, respectively, the region of the bulk and surface spin waves (SW)) are calculated numerically for the high-temperature phase. Two situations are analyzed, depending on the position of the interstitial impurity: the impurity is in the surface (N=1) and the impurity is in the bulk region (N>2).

Suggested Citation

  • M. M. Freire & Raimundo N. Costa Filho & R. V. Leite, 2017. "Green’s functions theory for an interstitial magnetic impurity in a transverse Ising ferromagnet," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 28(04), pages 1-14, April.
    • Handle: RePEc:wsi:ijmpcx:v:28:y:2017:i:04:n:s0129183117500498
    DOI: 10.1142/S0129183117500498
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