Atomistic simulations of α - Fe /Nd2Fe14B magnetic core/shell nanocomposites with enhanced energy product for high temperature permanent magnet applications

Sam C. Westmoreland; Connor Skelland; Tetsuya Shoji; Masao Yano; Akira Kato; Masaaki Ito; Gino Hrkac; Thomas Schrefl; Richard F.L. Evans; Roy W. Chantrell

doi:10.1063/1.5126327

Atomistic simulations of α - Fe /Nd₂Fe₁₄B magnetic core/shell nanocomposites with enhanced energy product for high temperature permanent magnet applications

Sam C. Westmoreland, Connor Skelland, Tetsuya Shoji, Masao Yano, Akira Kato, Masaaki Ito, Gino Hrkac, Thomas Schrefl, Richard F.L. Evans^*, Roy W. Chantrell

^*Corresponding author for this work

Physics

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

Abstract

Nd 2 Fe 14 B has generated significant interest since its discovery in the 1980s due to its impressive energy density, which makes it a prime candidate for use in permanent magnet applications. Its performance is known to suffer greatly at the high temperatures required for motor applications around 450 K. Core/shell nanocomposites provide a potential route to improve material performance by combining the highly anisotropic permanent magnet with a material with high moment and high Curie temperature. We have used an atomistic spin model to investigate the magnetic properties of Nd 2 Fe 14 B with α - F e in a core/shell nanostructure. We find that at typical motor operating temperatures, increasing α - F e content reduces the coercivity of the system while enhancing the saturation magnetization. The overall effect is that an improvement in B H max is seen with increasing α - F e up to an optimal value of 70 vol. %. This property of core/shell nanostructures would make them a suitable substitute for pure Nd 2 Fe 14 B while simultaneously lowering the raw material cost of the permanent magnet component of high-performance motors.

Original language	English
Article number	133901
Number of pages	8
Journal	Journal of Applied Physics
Volume	127
Issue number	13
Early online date	1 Apr 2020
DOIs	https://doi.org/10.1063/1.5126327
Publication status	Published - 7 Apr 2020

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10.1063/1.5126327

Atomistic simulations of α-Fe/Nd2Fe14B magnetic core/shell nanocomposites with enhanced energy product for high temperature permanent magnet applications
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Westmoreland, S. C., Skelland, C., Shoji, T., Yano, M., Kato, A., Ito, M., Hrkac, G., Schrefl, T., Evans, R. F. L., & Chantrell, R. W. (2020). Atomistic simulations of α - Fe /Nd₂Fe₁₄B magnetic core/shell nanocomposites with enhanced energy product for high temperature permanent magnet applications. Journal of Applied Physics, 127(13), Article 133901. https://doi.org/10.1063/1.5126327

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abstract = "Nd 2 Fe 14 B has generated significant interest since its discovery in the 1980s due to its impressive energy density, which makes it a prime candidate for use in permanent magnet applications. Its performance is known to suffer greatly at the high temperatures required for motor applications around 450 K. Core/shell nanocomposites provide a potential route to improve material performance by combining the highly anisotropic permanent magnet with a material with high moment and high Curie temperature. We have used an atomistic spin model to investigate the magnetic properties of Nd 2 Fe 14 B with α - F e in a core/shell nanostructure. We find that at typical motor operating temperatures, increasing α - F e content reduces the coercivity of the system while enhancing the saturation magnetization. The overall effect is that an improvement in B H max is seen with increasing α - F e up to an optimal value of 70 vol. %. This property of core/shell nanostructures would make them a suitable substitute for pure Nd 2 Fe 14 B while simultaneously lowering the raw material cost of the permanent magnet component of high-performance motors.",

author = "Westmoreland, {Sam C.} and Connor Skelland and Tetsuya Shoji and Masao Yano and Akira Kato and Masaaki Ito and Gino Hrkac and Thomas Schrefl and Evans, {Richard F.L.} and Chantrell, {Roy W.}",

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Westmoreland, SC, Skelland, C, Shoji, T, Yano, M, Kato, A, Ito, M, Hrkac, G, Schrefl, T, Evans, RFL & Chantrell, RW 2020, 'Atomistic simulations of α - Fe /Nd₂Fe₁₄B magnetic core/shell nanocomposites with enhanced energy product for high temperature permanent magnet applications', Journal of Applied Physics, vol. 127, no. 13, 133901. https://doi.org/10.1063/1.5126327

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AU - Westmoreland, Sam C.

AU - Skelland, Connor

AU - Shoji, Tetsuya

AU - Yano, Masao

AU - Kato, Akira

AU - Ito, Masaaki

AU - Hrkac, Gino

AU - Schrefl, Thomas

AU - Evans, Richard F.L.

AU - Chantrell, Roy W.

PY - 2020/4/7

Y1 - 2020/4/7

N2 - Nd 2 Fe 14 B has generated significant interest since its discovery in the 1980s due to its impressive energy density, which makes it a prime candidate for use in permanent magnet applications. Its performance is known to suffer greatly at the high temperatures required for motor applications around 450 K. Core/shell nanocomposites provide a potential route to improve material performance by combining the highly anisotropic permanent magnet with a material with high moment and high Curie temperature. We have used an atomistic spin model to investigate the magnetic properties of Nd 2 Fe 14 B with α - F e in a core/shell nanostructure. We find that at typical motor operating temperatures, increasing α - F e content reduces the coercivity of the system while enhancing the saturation magnetization. The overall effect is that an improvement in B H max is seen with increasing α - F e up to an optimal value of 70 vol. %. This property of core/shell nanostructures would make them a suitable substitute for pure Nd 2 Fe 14 B while simultaneously lowering the raw material cost of the permanent magnet component of high-performance motors.

AB - Nd 2 Fe 14 B has generated significant interest since its discovery in the 1980s due to its impressive energy density, which makes it a prime candidate for use in permanent magnet applications. Its performance is known to suffer greatly at the high temperatures required for motor applications around 450 K. Core/shell nanocomposites provide a potential route to improve material performance by combining the highly anisotropic permanent magnet with a material with high moment and high Curie temperature. We have used an atomistic spin model to investigate the magnetic properties of Nd 2 Fe 14 B with α - F e in a core/shell nanostructure. We find that at typical motor operating temperatures, increasing α - F e content reduces the coercivity of the system while enhancing the saturation magnetization. The overall effect is that an improvement in B H max is seen with increasing α - F e up to an optimal value of 70 vol. %. This property of core/shell nanostructures would make them a suitable substitute for pure Nd 2 Fe 14 B while simultaneously lowering the raw material cost of the permanent magnet component of high-performance motors.

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