Anisotropy effects on the magnetic excitations of a ferromagnetic monolayer below and above the Curie temperature (Articolo in rivista)

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  • Anisotropy effects on the magnetic excitations of a ferromagnetic monolayer below and above the Curie temperature (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
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  • 10.1103/PhysRevB.72.014454 (literal)
Alternative label
  • M. G. Pini; P. Politi; R. L. Stamps (2005)
    Anisotropy effects on the magnetic excitations of a ferromagnetic monolayer below and above the Curie temperature
    in Physical review. B, Condensed matter and materials physics; American Physical Society (APS), College Pk (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. G. Pini; P. Politi; R. L. Stamps (literal)
Pagina inizio
  • 014454-1 (literal)
Pagina fine
  • 014454-11 (literal)
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  • http://link.aps.org/doi/10.1103/PhysRevB.72.014454 (literal)
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  • 72 (literal)
Rivista
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  • American Physical Society (APS). (literal)
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  • 11 (literal)
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  • 1 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 1) Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Sezione di Firenze, Via Madonna del Piano, I-50019 Sesto Fiorentino, Italy 2) INFM, UdR Firenze, Via G. Sansone 1, I-50019 Sesto Fiorentino, Italy 3) School of Physics, University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia (literal)
Titolo
  • Anisotropy effects on the magnetic excitations of a ferromagnetic monolayer below and above the Curie temperature (literal)
Abstract
  • The field-driven reorientation transition of an anisotropic ferromagnetic monolayer is studied within the context of a finite-temperature Green's-function theory. The equilibrium state and the field dependence of the magnon energy gap E0 are calculated for static magnetic field H applied in plane along an easy or hard axis. In the latter case, the in-plane reorientation of the magnetization is shown to be continuous at T=0, in agreement with free-spin-wave theory, and discontinuous at finite temperature T>0, in contrast with the prediction of mean-field theory. The discontinuity in the orientation angle creates a jump in the magnon energy gap, and it is the reason why, for T>0, the energy does not go to zero at the reorientation field. approach. Above the Curie temperature TC, the magnon energy gap E0(H) vanishes for H=0 in both the easy and hard cases. As H is increased, the gap is found to increase almost linearly with H, but with different slopes depending on the field orientation. In particular, the slope is smaller when H is along the hard axis. Such a magnetic anisotropy of the spin-wave energies is shown to persist well above TC (T approx 1.2TC). (literal)
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