| 摘要 |
To provide an R-T-B based sintered magnet having high Br and high HcJ without using Dy by solving a problem that a significant reduction in Br due to a decrease in B concentration and HcJ are insufficient to satisfy recent requirements. Disclosed is an R-T-B based sintered magnet which includes an Nd2Fe14B 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. |
