6,116 research outputs found

    Acoustic attenuation in magnetic insulator films: dynamical phase-field simulations

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    A magnon and a phonon are the quanta of spin wave and lattice wave, respectively, and they can hybridize into a magnon polaron when their frequencies and wavenumbers are equal. Guided by an analytically calculated magnon polaron dispersion, we perform dynamical phase-field simulations to investigate the effects of magnon polaron formation and magnetic damping on the attenuation of a bulk acoustic wave in a magnetic insulator film. It is found that a stronger magnon-phonon hybridization leads to a larger attenuation, whereas the largest attenuation occurs under an intermediate magnetic damping coefficient. The simulations also demonstrate a dynamic rotation of the acoustic wave polarization by almost 90{\deg} and a dynamic magnetic-field control of acoustic wave antennation, which have potential applications in nonreciprocal acoustic devices.Comment: 5 figure

    Isotropic 3D Super Resolution Imaging with Self-Bending Point Spread Function

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