Simultaneous existence of two spin-wave modes in ultrathin Fe/GaAs(001) films studied by Brillouin light scattering: Experiment and theory (Articolo in rivista)

Type
Label
  • Simultaneous existence of two spin-wave modes in ultrathin Fe/GaAs(001) films studied by Brillouin light scattering: Experiment and theory (Articolo in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.70.094422 (literal)
Alternative label
  • M. G. Pini (1,2); P. Politi (1,2); A. Rettori (2,3); G. Carlotti (4,5); G. Gubbiotti (5); M. Madami (4,5); S. Tacchi (4,5) (2004)
    Simultaneous existence of two spin-wave modes in ultrathin Fe/GaAs(001) films studied by Brillouin light scattering: Experiment and theory
    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 (1,2); P. Politi (1,2); A. Rettori (2,3); G. Carlotti (4,5); G. Gubbiotti (5); M. Madami (4,5); S. Tacchi (4,5) (literal)
Pagina inizio
  • 094422-1 (literal)
Pagina fine
  • 094422-6 (literal)
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  • http://link.aps.org/doi/10.1103/PhysRevB.70.094422 (literal)
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  • 70 (literal)
Rivista
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  • American Physical Society (APS) (literal)
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  • 6 (literal)
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  • 9 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • (1) Istituto di Fisica Applicata \"N. Carrara\", CNR, Via Madonna del Piano, I-50019 Sesto Fiorentino, Italy (2) INFM, Unità di Firenze, Via G. Sansone 1, I-50019 Sesto Fiorentino, Italy (3) Dipartimento di Fisica, Università di Firenze, Via G. Sansone 1, I-50019 Sesto Fiorentino, Italy (4) Dipartimento di Fisica, Università di Perugia, Via Pascoli, I-06123 Perugia, Italy (5) INFM, Unità di Perugia, Via Pascoli, I-06123 Perugia, Italy (literal)
Titolo
  • Simultaneous existence of two spin-wave modes in ultrathin Fe/GaAs(001) films studied by Brillouin light scattering: Experiment and theory (literal)
Abstract
  • A double-peaked structure was observed in the in situ Brillouin Light Scattering (BLS) spectra of a 6 Å thick epitaxial Fe/GaAs(001) film for values of an external magnetic field H, applied along the hard in plane direction, lower than a critical value Hc approx 0.9 kOe. This experimental finding is theoretically interpreted in terms of a model which assumes a nonhomogeneous magnetic ground state characterized by the presence of perperpendicular up/down stripe domains. For such a ground state, two spin-wave modes, namely an acoustic and an optic mode, can exist. Upon increasing the field the magnetization tilts in the film plane, and for H > or = Hc the ground state is homogeneous, thus allowing the existence of just a single spin-wave mode. The frequencies of the two spin-wave modes were calculated and successfully compared with the experimental data. The field dependence of the intensities of the corresponding two peaks that are present in the BLS spectra was also estimated, providing further support to the above-mentioned interpretation. (literal)
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