Effect of P addition on microstructure and soft magnetic properties of Fe(73.5−)Nb3Cu1P Si13.5B9 alloys

Abstract The microstructure and soft magnetic properties of P-doped nanocrystalline Fe 73.5− x Nb 3 Cu 1 P x Si 13.5 B 9 ( x = 0 , 1 and 3) alloys were studied. The primary crystallization temperature and crystalline peak are 796 and 823 K, 801 and 851 K, and 803 and 853 K, respectively, for x = 0 , 1 and 3. The grain size and coercivity are 8.8 nm and 1.5 A/m, 9.2 nm and 2.1 A/m, and 15.3 nm and 3.5 A/m, respectively after annealing. Complex permeability decreases with increase of x at lower frequency range. The core loss is almost independent of x above 10 kHz.