Three-Dimensional Large-Scale Micromagnetics Simulation Using Fast Fourier Transformation

We have successfully performed a large-scale micromagnetics simulation for more than 100 million cells with long-range dipolar interaction using the fast Fourier transform method. The recent demand for a coercivity mechanism in permanent magnets requires an extremely large simulation size, requiring a large-scale micromagnetics simulator. We have developed a large-scale micromagnetics simulator in which a magnetostatic energy calculation is implemented using fast Fourier transform. A hybrid parallel algorithm, which is a combination of shared-memory and distributed-memory parallel algorithms, is used to handle large data arrays. The simulation was carried out on a Hitachi SR16000/M1 supercomputer. The hybrid parallel algorithm used to perform large-scale micromagnetics simulations is discussed.