Reprint of Multiscale model approaches to the design of advanced permanent magnets

S. C. Westmoreland; R. F.L. Evans; G. Hrkac; T. Schrefl; G. T. Zimanyi; M. Winklhofer; N. Sakuma; M. Yano; A. Kato; T. Shoji; A. Manabe; M. Ito; R. W. Chantrell

doi:10.1016/j.scriptamat.2018.04.019

Reprint of Multiscale model approaches to the design of advanced permanent magnets

S. C. Westmoreland^*, R. F.L. Evans, G. Hrkac, T. Schrefl, G. T. Zimanyi, M. Winklhofer, N. Sakuma, M. Yano, A. Kato, T. Shoji, A. Manabe, M. Ito, R. W. Chantrell

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

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 weak 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.

Original language	English
Pages (from-to)	266-272
Number of pages	7
Journal	Scripta Materialia
Volume	154
Early online date	17 Jul 2018
DOIs	https://doi.org/10.1016/j.scriptamat.2018.04.019
Publication status	Published - 1 Sept 2018

Keywords

Atomistic
Micromagnetic
Multiscale
Permanent magnets
Pinning

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10.1016/j.scriptamat.2018.04.019

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Westmoreland, S. C., Evans, R. F. L., Hrkac, G., Schrefl, T., Zimanyi, G. T., Winklhofer, M., Sakuma, N., Yano, M., Kato, A., Shoji, T., Manabe, A., Ito, M., & Chantrell, R. W. (2018). Reprint of Multiscale model approaches to the design of advanced permanent magnets. Scripta Materialia, 154, 266-272. Advance online publication. https://doi.org/10.1016/j.scriptamat.2018.04.019

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abstract = "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 weak 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.",

keywords = "Atomistic, Micromagnetic, Multiscale, Permanent magnets, Pinning",

author = "Westmoreland, {S. C.} and Evans, {R. F.L.} and G. Hrkac and T. Schrefl and Zimanyi, {G. T.} and M. Winklhofer and N. Sakuma and M. Yano and A. Kato and T. Shoji and A. Manabe and M. Ito and Chantrell, {R. W.}",

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doi = "10.1016/j.scriptamat.2018.04.019",

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T1 - Reprint of Multiscale model approaches to the design of advanced permanent magnets

AU - Westmoreland, S. C.

AU - Evans, R. F.L.

AU - Hrkac, G.

AU - Schrefl, T.

AU - Zimanyi, G. T.

AU - Winklhofer, M.

AU - Sakuma, N.

AU - Yano, M.

AU - Kato, A.

AU - Shoji, T.

AU - Manabe, A.

AU - Ito, M.

AU - Chantrell, R. W.

PY - 2018/9/1

Y1 - 2018/9/1

N2 - 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 weak 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.

AB - 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 weak 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.

KW - Atomistic

KW - Micromagnetic

KW - Multiscale

KW - Permanent magnets

KW - Pinning

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U2 - 10.1016/j.scriptamat.2018.04.019

DO - 10.1016/j.scriptamat.2018.04.019

M3 - Article

AN - SCOPUS:85047071852

SN - 1359-6462

VL - 154

SP - 266

EP - 272

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Reprint of Multiscale model approaches to the design of advanced permanent magnets

Abstract

Keywords

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