Date of this Version
Materials Science and Engineering B 186, 2014
Single-phaseZr2Co11 nanomagnetic materials with high coercivity have been fabricated by melt spin-ning with subsequent annealing under Ar, N2, and vacuum. Annealing coarsens the grains and de-creases the density of defects, leading to intergrain decoupling action and the enhancement of the magnetocrystalline anisotropy field of the hard magnetic phase. Therefore, coercivity increases 44.7% from 6.7 kOe for the as-spun to 9.7 kOe for the annealed, which is the highest among Zr–Co alloys so far. The results show that the magnetic-hardening mechanism is primarily dominated by domain-wall pinning. In addition, annealing clearly increases the saturation magnetization. The above results indicate that Zr2Co11 has potential for fabricating rare-earth-free permanent-magnet nanocomposites.