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              <p>Electromagnons, which are coupled polar and magnetic excitations in magnetoelectric materials, are of large interest for electronic and computing technological devices. Using Molecular Dynamics simulations based on an ab-initio effective Hamiltonian, we predict that the frequency of several electromagnons can be tuned by the application of electric fields in the model multiferroic BiFeO 3 , with this frequency either increasing or decreasing depending on the selected electromagnon. In particular, we show that the frequency of electromagnons localized at ferroelectric domain walls can be tuned over a 200 GHz range by realistic dc electric fields. We interpret the realized frequency increase (respectively, decrease) by local hardening (respectively, softening) of the associated polar phonons which couples to the applied electric field. The increase versus decrease of the electromagnons' frequency is further found to be correlated with the real-space localization of such phonons.</p>
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