Hybrid finite-element/boundary-element method to calculate Oersted fields

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:369

Article

Hertel, Riccardo¹  Kakay, Attila² 

[1] Univ Strasbourg, CNRS UMR 7504, Inst Phys & Chim Mat Strasbourg, Strasbourg, France

[2] Forschungszentrum Julich, Peter Grunberg Inst PGI 6, D-52428 Julich, Germany

关键词: Oersted field;    Micromagnetic simulation;    Finite element method;    Current density distribution;   

DOI  :  10.1016/j.jmmm.2014.06.047

来源: Elsevier

【 摘 要 】

The article presents a general-purpose hybrid finite-element/boundary-element method (FEM/BEM) to calculate magnetostatic fields generated by stationary electric currents eras. The efficiency of this code lies in its ability to simulate Oersted fields in complex geometries with non-uniform current density distributions. As a precursor to the calculation of the Oersted field, an FEM algorithm is employed to calculate the electric current density distribution. The accuracy of the code is confirmed by comparison with analytic results. Two examples show how this method provides important numerical data that can be directly plugged into micromagnetic simulations: The current density distribution in a thin magnetic strip with a notch, and the Oersted field in a three-dimensional contact geometry; similar to the type commonly used in spin-torque driven nano-oscillators. It is argued that a precise calculation of both, the Oersted field and the current density distribution, is essential for a reliable simulation of current-driven micromagnetic processes. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free