Multiscale model approaches to the design of advanced permanent magnets

SCRIPTA MATERIALIA

卷:148

Article

Westmoreland, S. C.¹  Evans, R. F. L.¹  Hrkac, G.²  Schrefl, T.³  Zimanyi, G. T.⁴  Winklhofer, M.⁵  Sakuma, N.⁶  Yano, M.⁶  Kato, A.⁶  Shoji, T.⁶  Manabe, A.⁶  Ito, M.⁶  Chantrell, R. W.¹ 

[1] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[2] Univ Exeter, CEMPS, Harrison Bldg, Exeter EX4 4QF, Devon, England

[3] Danube Univ Krems, Ctr Integrated Sensor Syst, Krems An Der Donau, Austria

[4] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[5] Carl von Ossietzky Univ Oldenburg, D-26129 Oldenburg, Germany

[6] Toyota Motor Co Ltd, 1200 Mishuku, Shizuoka 4101193, Japan

关键词: Permanent magnets;    Multiscale;    Micromagnetic;    Atomistic;    Pinning;   

DOI  :  10.1016/j.scriptamat.2018.01.019

来源: Elsevier

【 摘 要 】

We describe the process of multiscale modelling of magnetic materials, based on atomistic models coupled parametrically to micromagnetic calculations. At the atomistic lengthscale we use Spin Dynamics (SD) to study switching mechanisms, using structures predicted by Molecular Dynamics. The process is completed using SD to calculate the cell size and temperature dependent parameters for micromagnetic calculations. We demonstrate an unusually strong cell size scaling for Nd2Fe14B, and demonstrate numerically the existence of atomic scale Barkhausen jumps during magnetization switching. Scaling of magnetic properties is shown to be important in micromagnetic calculations of hysteresis, especially considering variation in micromagnetic cell size. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free