Materials Science and Engineering, Ames Laboratory
Journal or Book Title
Physical Review B
We demonstrate substantial enhancement in the energy product of MnBi-based magnets by forming robust ferromagnetic exchange coupling between a MnBi layer and a thin CoFe layer in a unique perpendicular coupling configuration, which provides increased resistance to magnetization reversal. The measured nominal energy product of 172kJ/m3 at room temperature is the largest value experimentally attained for permanent magnets free of expensive raw materials. Our finding shows that exchange-coupled MnBi/CoFe magnets are a viable option for pursuing rare-earth-free magnets with energy products approaching those containing rare-earth elements.
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Gao, T. R.; Fang, L.; Fackler, S.; Maruyama, S.; Zhang, X. H.; Wang, L. L.; Rana, T.; Manchanda, P.; Kashyap, A.; Janicka, K.; Wysocki, A. L.; N'Diaye, A. T.; Arenholz, E.; Borchers, J. A.; Kirby, B. J.; Maranville, B. B.; Sun, K. W.; Kramer, M. J.; Antropov, V. P.; Johnson, D. D.; Skomski, R.; Cui, J.; and Takeuchi, I., "Large energy product enhancement in perpendicularly coupled MnBi/CoFe magnetic bilayers" (2016). Ames Laboratory Publications. 395.