High performance isotropic permanent magnet based on Nd-Fe-B

Abstract

We have fabricated a macroscopically isotropic permanent magnet material (Ovonic Hi‐Rem^TM) which significantly exceeds conventionally understood performance limits for a material with saturation magnetization M_s =16 kG. Enhanced magnetic properties, including a remanent magnetization M_r =9–10 kG or more, and a maximum energy product in excess of 20 MGOe, are observed without preferred orientation. This material has been fabricated by rapid solidification of an alloy structurally and compositionally similar to Nd₂Fe₁₄B, but which depends on critical alloying additions and process parameters to obtain optimum magnetic performance.