The inevitable thermal demagnetization of magnets at high-temperatures is a key issue for Nd-Fe-B based permanent magnetic materials, especially electric motors. Here, we report the effect partially substituting element Holmium (Ho) on properties and microstructure nanocrystalline melt-spun [(NdPr)1−xHox]14.3Fe76.9B5.9M2.9 (x = 0–0.6; M Co, Cu, Al Ga) alloys. It shows that Ho can enter into mai...