R-T-B-BASED SINTERED MAGNET

摘要

To provide an R-T-B based sintered magnet having high B r and high H cJ without using Dy by solving a problem that a significant reduction in B r due to a decrease in B concentration and H cJ are insufficient to satisfy recent requirements. Disclosed is an R-T-B based sintered magnet which includes an Nd 2 Fe 14 B type compound as a main phase, and comprises the main phase, a first grain boundary phase located between two main phases, and a second grain boundary phase located between three or more main phases, wherein the first grain boundary phase having a thickness of 5 nm or more and 30 nm or less is present.