Abstract
We have developed a numerical model for investigating a motion of magnetic moments in ferromagnetic materials with spin transfer torque (STT). The model can be used to provide a basic understanding of the switching dynamics and can be used as a tool to design and develop magnetic random access memories (MRAM). The relevant equation used in this work was the Landau-Lifshitz-Gilbert (LLG) equation with the additional STT term. The equation was used to describe the dynamical behavior of a magnetization which is exposed to an applied spin current and an effective field. The effects of thermal fluctuations on the motion of magnetic moments were excluded. The model was implemented in MATLABTM using a finite difference method (FDM). The program was verified with two-spin system and standard problems. Simulation results were also compared with those obtained from OOMMF.
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