Influence of microstructure on the enhancement of soft magnetic character and the induced anisotropy of field annealed HITPERM-type alloys.

摘要

Hitperm-type rapidly quenched ribbons were submitted to field annealing, both longitudinal field(LF) and transversal field (TF) to the axis of the ribbon. LF annealing yields a reduction ofthe magnetic anisotropy and results can be explained in the frame of random anisotropy model.A coercivity of 3 A/m is obtained for Fe39Co39Nb6B15Cu1alloy. The addition of Cu to theseNb-containing Hitperm-type alloys is a key factor to refine the microstructure in order to reach thisvery low coercivity value. TF annealing produces samples with sheared hysteresis loops suitablefor sensor and high frequency applications.