(ESICMM-G8 Symposium on Next Generation Permanent Magnets, Tsukuba, 2015)
Computationally Guided Design of Magnets – Narrowing the Search for (non)Rare-Earth Magnets


Duane D. Johnson, Chief Research Officer, Ames National Laboratory, and F. Wendell Miller Professor of Energy Sciences, Iowa State University.

Division of Materials Science & Engineering, Ames Laboratory, 311 TASF, Iowa State University, Ames, IA, 50011, USA; and Department of Materials Science & Engineering, Iowa State University, Ames, IA, 50011, USA.

Abstract:

  We will discuss reliable use of materials theory and computational assessment of properties and materials stability to guide experimental improvement of properties and lower costs. Particular focus will be on reducing non-abundant rare earths while trying to maintain the energy products, and developing a Mn-Bi exchange-spring system with good room temperature (BH)max. Like all materials, defects and disorder often play an important role. The importance of partial-order and site-preference chemistry will be shown in alloyed 2-14-1 systems, i.e., (R-R’)2(Fe-M)14B with R,R’ a rare earth and M a transition metals. Examples will include key experimental validation.