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首页> 外文期刊>Journal of Computational Physics >Application of the fast multipole method for the evaluation of magnetostatic fields in micromagnetic computations
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Application of the fast multipole method for the evaluation of magnetostatic fields in micromagnetic computations

机译:快速多极方法在微磁计算中静磁场评估中的应用

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摘要

Micromagnetic simulations are elaborated to describe the magnetic dynamics in ferromagnetic bodies. In these simulations, most of the time is spent on the evaluation of the magnetostatic field in the magnetic material. This paper presents a new numerical finite difference scheme for the evaluation of the magnetostatic field based on the fast multipole method (FMM). The interactions between finite difference cells are described in terms of far and near field interactions. The far field computations are conducted using the spherical harmonic expansion of the magnetostatic field while the near field computations are accelerated using fast Fourier transforms (FFT). The performance of the presented FMM scheme is studied by comparing the scheme with a pure FFT scheme. The FMM scheme is more memory efficient and more flexible then the FFT scheme. It is accurate and still has a good time efficiency. (C) 2008 Elsevier Inc. All rights reserved.
机译:详细阐述了微磁模拟,以描述铁磁体中的磁动力学。在这些模拟中,大部分时间都用于评估磁性材料中的静磁场。本文提出了一种基于快速多极法(FMM)的静磁场估计数值有限差分方案。有限差分单元之间的相互作用是根据远场和近场相互作用来描述的。远场计算使用静磁场的球谐展开进行,而近场计算则使用快速傅里叶变换(FFT)进行加速。通过将该方案与纯FFT方案进行比较,研究了所提出的FMM方案的性能。与FFT方案相比,FMM方案具有更高的存储效率和灵活性。它是准确的,但仍具有良好的时间效率。 (C)2008 Elsevier Inc.保留所有权利。

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