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    Phonon-magnon resonant processes with relevance to acoustic spin pumping

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    PhysRevB.90.224421.pdf
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    Type
    Article
    Authors
    Deymier, P. A.
    Vasseur, J. O.
    Runge, K.
    Manchon, Aurelien cc
    Bou-Matar, O.
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2014-12-23
    Permanent link to this record
    http://hdl.handle.net/10754/346753
    
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    Abstract
    The recently described phenomenon of resonant acoustic spin pumping is due to resonant coupling between an incident elastic wave and spin waves in a ferromagnetic medium. A classical one-dimensional discrete model of a ferromagnet with two forms of magnetoelastic coupling is treated to shed light on the conditions for resonance between phonons and magnons. Nonlinear phonon-magnon interactions in the case of a coupling restricted to diagonal terms in the components of the spin degrees of freedom are analyzed within the framework of the multiple timescale perturbation theory. In that case, one-phonon-two-magnon resonances are the dominant mechanism for pumping. The effect of coupling on the dispersion relations depends on the square of the amplitude of the phonon and magnon excitations. A straightforward analysis of a linear phonon-magnon interaction in the case of a magnetoelastic coupling restricted to off-diagonal terms in the components of the spins shows a one-phonon to one-magnon resonance as the pumping mechanism. The resonant dispersion relations are independent of the amplitude of the waves. In both cases, when an elastic wave with a fixed frequency is used to stimulate magnons, application of an external magnetic field can be used to approach resonant conditions. Both resonance conditions exhibit the same type of dependency on the strength of an applied magnetic field.
    Citation
    Phonon-magnon resonant processes with relevance to acoustic spin pumping 2014, 90 (22) Physical Review B
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/PhysRevB.90.224421
    Additional Links
    http://link.aps.org/doi/10.1103/PhysRevB.90.224421
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevB.90.224421
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program

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