Permanent Magnets beyond Nd-Dy-Fe-B

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Abstract

Provision of a concise summary of recent developments of permanent magnet materials and the materials science underlining them toward realizing permanent magnets beyond the current Nd-Dy-Fe-B is attempted, and approaches to solving the remaining fundamental issues are discussed. Focused are two promising groups of materials: the ThMn12-type Fe-rich Sm(Fe1-xCox)12-based materials and the Nd2Fe14B-based materials. Materials science based on atomistic view of permanent magnet materials specifically developed for this purpose is required in order to break into a precise control of the microstructure in atomic levels with the aid of computational material engineering. Atomistic understandings of coercivity mechanism and differences in free energy associated with formation of non-equilibrium structures such as grain boundaries and interfaces with sub-phases are proposed to be essential.

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Hirosawa, S. (2019). Permanent Magnets beyond Nd-Dy-Fe-B. IEEE Transactions on Magnetics, 55(2). https://doi.org/10.1109/TMAG.2018.2863737

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