Development of high performance permanent magnets without reliance on scarce elements

Abstract

In order to realize a high coercivity permanent magnet, we have combined advanced multi-scale microstructure characterizations with magnetic domain observations and micromagnetic simulations to have a better understanding on microstructure-coercivity relationship. In this talk, we will first show how a high room temperature coercivity of 2.2 T with remanent magnetization of 1.30 T is achieved in Dy-free permanent magnets by control of grain size and shape, and engineering of the grain boundary phase. At the end of the talk, we will discuss the potential of SmFe12-based compound as future high performance permanent magnets.