Investigation of nanocomposite materials with ultrasoft and high performance hard magnetic properties (original) (raw)

In the system of Fe 73.5Àx Co x Nb 3 Cu 1 Si 13.5 B 9 (x ¼ 0; 2, 4, 6, 8) with increasing Co content the size of nano-particles in heat-treated ribbons, the Curie temperatures of amorphous phase and crystalline phase, and volume fraction of the heat-treated ribbons of a-Fe(Si) phase increase while the crystallization activation energy of a-Fe(Si) phase decreases. The presence of Co substituted for Fe makes the crystalline phase to be formed easily. Ultrasoft magnetic properties are established in the samples. The as-cast Nd 4.5 Fe 73.8 B 18.5 Co 2 Nb 1 Cu 0.2 ribbons are thermal-annealed in the range of 580-620 C for obtaining multiphase materials. After annealing at 610 C in 20 min, H C reaches 2.9 kOe, B r ¼ 11:9 kG, the reduced remanent ratio M r =M s ¼ 0:76 and maximum energy product ðBHÞ max ¼ 15:2 MGOe.