Spin wave beam propagation in ferromagnetic thin film with graded refractive index: mirage effect and prospective applications

Abstract

Using analysis of iso-frequency contours of the spin-wave dispersion relation, supported by micromagnetic simulations, we study the propagation of spin-wave (SW) beams in thin ferromagnetic films through the areas of the inhomogeneous refractive index. We compare the transmission and reflection of SWs in areas with gradual and step variation of the SW refractive index. In particular, we show the mirage effect for SWs with narrowing SW beam width, and an application of the gradual modulation of the SWs refractive index as a diverging lens. Furthermore, we study the propagation of SWs in ferromagnetic stripe with modulated refractive index. We demonstrate that the system can be considered as the graded-index waveguide, which preserves the width of the SW beam for a long distance-the property essential for prospective applications of magnonics.

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• X-Ray Microscopy of Spin Wave Focusing using a Fresnel Zone Plate
• Graded index lenses for spin wave steering
• Spin-Wave Optical Elements: Towards Spin-Wave Fourier Optics
• An anomalous refraction of spin waves as a way to guide signals in curved magnonic multimode waveguides
• Fast and robust magnon transport in a spin chain
• Spin-wave Talbot effect in thin ferromagnetic film
• Engineered magnetization and exchange stiffness in direct-write Co-Fe nanoelements
• Reversible tuning of omnidirectional band gaps in two-dimensional magnonic crystals by magnetic field and in-plane squeezing
• Local non-linear excitation of sub-100 nm bulk-type spin waves by edge-localized spin waves in magnetic films