Coercivity and magnetic anisotropy of (Fe0.76 si0.09 b0.10 p0.05)97.5 nb2.0 cu0.5 amorphous and nanocrystalline alloy produced by gas atomization process

Abstract

We present the evolution of magnetic anisotropy obtained from the magnetization curve of (Fe0.76 Si0.09 B0.10 P0.05)97.5 Nb2.0 Cu0.5 amorphous and nanocrystalline alloy produced by a gas atomization process. The material obtained by this process is a powder exhibiting amorphous character in the as-atomized state. Heat treatment at 480◦ C provokes structural relaxation, while annealing the powder at 530◦ C for 30 and 60 min develops a fine nanocrystalline structure. Magnetic anisotropy distribution is explained by considering dipolar effects and the modified random anisotropy model.