Since their introduction in the 1980s, sintered NdFeB permanent magnets have been widely used in automotive, wind power, aerospace, defense, and many other industries due to their outstanding magnetic performance. In recent years, rapidly growing demand from applications such as wind turbines and new energy vehicles has placed increasingly higher requirements on the coercivity and thermal stability of NdFeB magnets. Because the magnetocrystalline anisotropy field of the Dy₂Fe₁₄B phase is significantly higher than that of Nd₂Fe₁₄B, and its Curie temperature