Geometry-driven control of magnetic states and spin-wave modes in bridged magnetic dots

Abstract Through micromagnetic simulations, we have investigated the influence of bridge geometry—specifically the modulation parameter λ -on the static and dynamic magnetic properties of bridged dot nanostructures. Our analysis revealed two distinct magnetic evolution paths: one leading to metastable vortex and antivortex configurations, and another converging to quasi-uniform ferromagnetic states. The dynamic susceptibility spectra show that each magnetic path supports a characteristic set of spin-wave resonance modes, with frequencies and spatial profiles that vary systematically with λ . We demonstrate that by tuning this geometric parameter, it is possible to achieve precise control over the number, frequency, and spatial localization of spin-wave modes. These findings provide a foundation for designing reconfigurable magnonic devices and open new avenues for the development of geometry-engineered spintronic and signal-processing applications.