Optimization of Multi-Frequency Magnonic Waveguides with Enhanced Group Velocities by Exchange Coupled Ferrimagnet/Ferromagnet Bilayers

Abstract

We report broadband spectroscopy and numerical analysis by which we explore propagating spin waves in a magnetic bilayer consisting of a 23 nm thick permalloy film deposited on 130 nm thick $Y_{3}F{e}_5{O}_{12}$. In the bilayer, we observe a characteristic mode that exhibits a considerably larger group velocity at small in-plane magnetic field than both the magnetostatic and perpendicular standing spin waves. Using the finite element method, we confirm the observations by simulating the mode profiles and dispersion relations. They illustrate the hybridization of spin wave modes due to exchange coupling at the interface. The high-speed propagating mode found in the bilayer can be utilized to configure multi-frequency spin wave channels enhancing the performance of spin wave based logic devices.

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• The building blocks of magnonics
• Magnonic crystals for data processing
• Reconfigurable nano-scale spin-wave directional coupler
• Spin waves in coupled YIG/Co heterostructures
• Measurements of the exchange stiffness of YIG films by microwave resonance techniques
• Phase reciprocity of spin-wave excitation by a microstrip antenna
• Sub-micrometer yttrium iron garnet LPE films with low ferromagnetic resonance losses
• Nonreciprocal Dispersion of Spin Waves in Ferromagnetic Thin Films Covered with a Finite-Conductivity Metal
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Cited by in corpus (6)

• Coherent spin pumping in a strongly coupled magnon-magnon hybrid system
• Spin-Wave frequency division multiplexing in an yttrium iron garnet microstripe magnetized by inhomogeneous field
• Experimental parameters, combined dynamics, and nonlinearity of a Magnonic-Opto-Electronic Oscillator (MOEO)
• Strong coupling of quantized spin waves in ferromagnetic bilayers
• Effect of Substrate on Spin-Wave Propagation Properties in Ferrimagnetic Thulium Iron Garnet Thin Films
• Nonreciprocal Spin Waves Driven by Left-Hand Microwaves