A frequency-domain micromagnetic simulation module based on COMSOL Multiphysics

Abstract

Micromagnetic simulation is a numerical method to solve the Landau-Lifshitz-Gilbert (LLG) equation for magnetic dynamics. Most of the mainstream micromagnetic simulation packages, including the object oriented micromagnetic framework and MuMax3, perform simulation in the time domain. Here, utilizing the frequency domain simulation capability of COMSOL Multiphysics, we developed a COMSOL-based micromagnetic simulation module that solves the LLG equation in the frequency domain, which runs much faster and more accurate than time-domain simulations. Frequency-domain simulation is ideal for finding spin wave eigenmodes and the corresponding dispersions. We verify the validity of the module using three examples in the absence of dipolar field, and the inclusion of the dipolar field can be incorporated by combining this module with the alternating current/direct current module within COMSOL.