Thickness‐Dependent Reconfigurable Spin‐Wave Dynamics in Ni 80 Fe 20 Nanostripe Arrays

Abstract

Ferromagnetic nanostripes have gained massive attention due to their intriguing magnetic properties associated with dimensional confinements and shape anisotropy leading toward potential applications in magnetic storage, memory, and spin-wave-based devices. Consequently, reconfiguration of their static and dynamic magnetic properties by the geometric parameters and external field is imperative. Here, a combined experimental and numerical study of the reconfigurable spin-wave dynamics in arrays of ferromagnetic nanostripes by the stripe thickness and external magnetic field strength and orientation is presented. Different uniform, localized, and standing spin waves in the nanostripes and their monotonic and nonmonotonic variation, including mode merging with these parameters, are observed. The observed variations are interpreted with the aid of simulated spin configurations, magnetostatic field maps, and spin-wave mode profiles. Further numerical study reveals anisotropic spin-wave propagation in nanostripes for different thicknesses and in different bias-field geometry opening potential applications in magnonic circuit components such as reconfigurable magnonic waveguides and omnidirectional spin-wave emitters.