Resonant transmission of electromagnetic energy through thick ferromagnetic films via phonons

Phonon Transport Controlled by Ferromagnetic Resonance

“…The H position of the peaks [Fig. 3 To model the phonons transport, we take into consideration both phonon attenuation and generation [28,29] manipulated by the magnetic dynamics, during the SAW-driven FMR. Angular momentum interconversion between magnon and phonons is related to the Einstein-de Haas effect [14,18] and the Barnett effect [21].…”

“…Due to the magnon-phonon interconversion during FMR, phonons will redistribute the angular momentum and energy between magnons and phonons [15,17], and thus macroscopic mechanical rotation can be strengthened, leading to an enhancement of the transmission of the SAW. The change of the SAW transmitted power (E) related to the phonon attenuation and generation during FMR can be rewritten as [28,29]:…”

“…and the H dependence for the line shape of the transmission power is determined by the parameters p, η and β. Equation (1) corresponds to the conventional microwave transmission through a Ni film [28,29], but employs instead of an externally applied real microwave magnetic field the effective ac magnetic field due to the magnon-phonon interaction defined in Eq. ( 5)…”

“…In the present work, we have investigated the dependence of the phonon transport on magnetization dynamics in Ni/LiNbO 3 hybrid heterostructures. We observe the simultaneous existence of dips and peaks in the transmission power of the surface acoustic waves (SAW) device, which we interpret by considering both phonon attenuation and generation [28,29]. By fitting the theory [28,29] to the phonon transmission power, the value of the FMR field, resonance linewidth and the exchange stiffness parameter of the magnon system can be estimated.…”

“…We observe the simultaneous existence of dips and peaks in the transmission power of the surface acoustic waves (SAW) device, which we interpret by considering both phonon attenuation and generation [28,29]. By fitting the theory [28,29] to the phonon transmission power, the value of the FMR field, resonance linewidth and the exchange stiffness parameter of the magnon system can be estimated. The obtained resonant linewidth of the SAW driven FMR is very similar to those from waveguide FMR experiment.…”