Fast Micromagnetic Simulation of Vortex Core Motion by GPU
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概要
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Micromagnetic simulation has been used to calculate magnetization distribution and dynamics in nanoscale magnetic materials. A method reducing the calculation time is needed because it requires prolonged periods for calculation. We propose a method of calculation to reduce the calculation time with a graphics processing unit (GPU). The speed with the proposed method is fifteen times faster than that with the conventional one with a CPU at maximum. Because a GPU has very fast single precision calculation units and relatively slow double precision calculation units, it is necessary to use single precision units for fast calculation with a GPU. The difference between the results of one calculation with single and double precision units is very small. However, this difference accumulates in simulations. There is a possibility the results may change due to this difference. This effect is investigated with static and dynamic simulations with a vortex structure in a nanodot. The relative differences in static and dynamic calculations are 10-6 and 0.04, respectively. These differences are sufficiently small for practical simulations. Therefore, a method with a GPU is useful to obtain micromagnetic simulations of vortex core motion.
著者
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SATO T.
Department of Biostatistics, Graduate School of Medicine, Kyoto University
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NAKATANI Y.
Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate Sch
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Nakatani Y.
Department Of Computer Science University Of Electro-communications
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Sato T.
Department Of Anatomy Hiroshima University Of Medicine
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Nakatani Y.
Department of Computer Science, Univ. of Electro-Communications
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