We report on the design, verification and performance of M M 3, an open-source GPU-
accelerated micromagnetic simulation program. This software solves the timeand space
dependent magnetization evolution in nano-to micro scale magnets using a finite-difference
discretization. Its high performance and low memory requirements allow for large-scale
simulations to be performed in limited time and on inexpensive hardware. We verified each
part of the software by comparing results to analytical values where available and to …