Broadband magnetoelastic coupling in magphonic crystals for high-frequency nanoscale spin wave generation

Abstract

Spin waves are promising candidates for information carriers in advanced technology. The interactions between spin waves and acoustic waves in magnetic nanostructures are of much interest because of their potential application for spin wave generation, amplification and transduction. We investigate numerically the dynamics of magnetoelastic excitations in a one-dimensional magphonic crystal consisting of alternating layers of permalloy and cobalt. We use the plane wave method and the finite element method for frequency- and time-domain simulations, respectively. The studied structure is optimized for hybridization of specific spin-wave and acoustic dispersion branches in the entire Brillouin zone in a broad frequency range. We show that this type of periodic structure can be used for efficient generation of high-frequency spin waves.

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• Confined magnetoelastic waves in thin waveguides
• Magnon polarons in the spin Peltier effect
• Coupled mode theory for the acoustic wave and spin wave interaction in the magphonic crystals: Propagating magnetoelastic waves
• Controlling acoustic waves using magnetoelastic Fano resonances
• Co- and contra-directional vertical coupling between ferromagnetic layers with grating for short-wavelength spin wave generation
• Magnon Polarons induced by a magnetic field gradient
• Optical excitation and detection of high-frequency Sezawa modes in Si/SiO2 system decorated with Ni80Fe20 nanodot arrays
• The studies on phonons and magnons in (Ni80Fe20/Au/Co/Au) multilayers of different number of repetitions