Parallel Computations Based Micromagnetic Solver and Analysis Tools for Magnon-Microwave Interaction Studies

Theinteraction of microwaves with magnetic materials gives rise to interesting and useful phenomena. The study of many such phenomena is, however, often complicated due to the nature of magnetic materials and/or the limitations in experimental techniques. In this work, we discuss the construction of a Landau Lifshitz Gilbert (LLG) equation-based micromagnetics solver using the parallel programming language- CUDA to study microwave-magnet interactions. The use of CUDA on Graphics Processing Units (GPUs) allows us to leverage the inherently parallel nature of the magnetic systems, thereby allowing large-scale (spatial and temporal) simulation-based studies that are otherwise unreasonable. In addition, computational techniques that allow a magnon-based interpretation of the physical processes are also introduced. Basic nonlinear magnonic phenomena, e.g., 3- and 4-magnon scattering and magnon growth dynamics, have been demonstrated. We show for the first time the direct excitation of magnons with nonzero wave-vectors in the context of parallel microwave pumping.