Maximum performance of permanent magnet materials

H. Akai

Index: 10.1016/j.scriptamat.2018.02.006

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Abstract

Calculations based on density functional theory conclude that the plausible upper limits of saturation magnetic polarization, magnetic transition temperature, and the magnetocrystalline anisotropy constant of permanent magnet materials could be ∼2.7 T, ∼2000 K, and ∼1000 MJ m−3, respectively. It is suggested that a possible strategy to reach these values for high-performance permanent magnets is to design Fe-based magnets containing a small amount of light rare earth elements, together with some additional elements including V, Cr, Co, Ni, and possibly typical elements as interstitials. The idea of creating high-performance permanent magnets without rare earth elements can be dispensed with.