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

Research output: Contribution to journalArticlepeer-review


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 languageEnglish
Article number133901
Number of pages8
JournalJournal of Applied Physics
Issue number13
Early online date1 Apr 2020
Publication statusPublished - 7 Apr 2020

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