Large energy product enhancement in perpendicularly coupled MnBi/CoFe magnetic bilayers

2016 
Author(s): Gao, TR; Fang, L; Fackler, S; Maruyama, S; Zhang, XH; Wang, LL; Rana, T; Manchanda, P; Kashyap, A; Janicka, K; Wysocki, AL; N'Diaye, AT; Arenholz, E; Borchers, JA; Kirby, BJ; Maranville, BB; Sun, KW; Kramer, MJ; Antropov, VP; Johnson, DD; Skomski, R; Cui, J; Takeuchi, I | Abstract: © 2016 American Physical Society. 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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