MSM 2000
MSM 2000
Technical Proceedings of the 2000 International Conference on Modeling and Simulation of Microsystems

Signal Integrity Simulation and Verification Chapter 9

Wavelet Based Matrix Compression in Numerical Micromagnetics

Authors: T. Schrefl, D. Süss and J. Fidler

Affilation: Vienna University of Technology, Austria

Pages: 429 - 432

Keywords: micromagnetics, finite elements, boundary elements, wavelets, matrix compression

Magnetic sensors and magneto-mechanic devices consist of spatially distinct ferromagnetic parts. Modeling their functional behavior requires to take into account the magnetostatic interactions between the magnetic elements. A hybrid finite element / boundary element method is combined with a wavelet matrix compression technique to simulate magnetization reversal of an array of magnetic nano-elements. This novel method reduces the storage requirements and the CPU time while keeping a reasonable accuracy. The boundary element matrix shows a sparsity of 80% to 90% with a corresponding relative error of the magnetic properties in the range of 2% to 5%. The calculated switching field of elongated NiFe nano-elements depends on magnetic state of neighboring elements. The spread in the switching field agrees with experimental data obtained from Lorentz electron microscopy.

ISBN: 0-9666135-7-0
Pages: 741