Modeling the effects of non-linear magnetic spin wave dynamics on RF circuits in COMSOL

Metamagnetics proposes to develop a set of computational models that captures the non-linear behavior in frequency and time domain of RF magnetic components, such as FSLs and SNEs, and deploy it within COMSOL, a multiphysics equation-based solver. In our approach, we will develop two independent modules in COMSOL; one that is based on phenomenological behavior and a second that is entirely based on physical principles, starting with an expanded form of Landau-Lifshitz-Gilbert equation of motion that incorporates non-linear effects. Using either module, we will couple solutions with COMSOLs standard electromagnetics RF module to model the linear and non-linear behavior of FSL and SNE type devices, and general non-linear effects. This approach will enable a self-contained software tool for solving non-linear RF devices and eliminate the need to pass data between different tools/engines. Leveraging COMSOLs built-in GUI and functionality, we will export power-dependent S-parameter data (X-parameters) of these devices for use in systems modeling software tools such as Keysight Technologies Advanced Design System (ADS). Development of these modules will empower design engineers with the ability to tailor the non-linear magnetic RF device behavior to desired specifications, and provide systems engineers with functional blocks that simulate device behavior in higher level assemblies.