Control of spin wave propagation in a microwaveguide with a two-dimensional array of magnetic cylinders of variable configuration

Background and Objectives: The development of magnonics, focusing on the transfer of magnetic moment or electron spin instead of charge, has opened new opportunities for the application of spin waves (SW) in the design of devices for data processing, transmission, and storage in the microwave and terahertz ranges. Yttrium iron garnet (YIG) films are used as the magnetic material for forming spin-waveguiding structures due to their exceptionally low SW damping, even at nanometer thicknesses. One promising approach to controlling SW is the use of two-dimensional arrays of magnetic nanostructures, such as cylinders and half-cylinders made of magnetite. Materials and Methods: This study involves numerical micromagnetic modeling of a microwave waveguide with an array of magnetite cylinders and half-cylinders on its surface. The modeling focuses on varying the geometric parameters of the nanostructures and the direction of the external magnetic field to investigate their influence on SW propagation characteristics. Magnetite was chosen due to its unique magnetic properties and compatibility with modern micro- and nanofabrication technologies. The micromagnetic modeling was based on the numerical solution of the Landau–Lifshitz–Gilbert equation. Results: The results of the modeling provide insights into the ability to predict and control SW behavior depending on the geometry of the magnetic elements and the orientation of the external magnetic field. This opens new perspectives for the development of highly efficient magnonic devices. Identifying optimal configurations for the cylinders and half-cylinders could lead to the creation of more compact and energy-efficient components for magnonic logic circuits and other applications in the field of magnonics. Conclusion: The study has presented a significant step towards the development of new magnonic devices operating on the principles of spin electronics. The findings offer potential for further exploration and optimization of spin wave dynamics in nanostructured waveguides, contributing to the advancement of magnonic technology.