The effect of annealing conditions on the magneto-mechanical properties of Fe-B-Si amorphous ribbons

Abstract

The effect of annealing conditions on the effective magneto‐mechanical coupling factor, Young’s modulus at constant external magnetic field and constant induction (c^H and c^B), the magnetic anisotropy and the incremental permeability are reported of Fe₈₀B₂₀, Fe₈₀B₁₅Si₅ and Fe₈₀B₁₀Si₁₀. The effect of transverse field annealing (parallel to the ribbon width) on k_eff is relatively small in F₈₀B₂₀ and Fe₈₀B₁₀Si₁₀. It results in k_eff values ranging from 0.5 to 0.6 and from 0.4 to 0.55, respectively. In Fe₈₀B₁₅Si₅ field annealing causes a marked increase in k_eff reaching a maximum value of 0.86 at a bias field of 60 A/m after annealing at a temperature of 350° C for 2 min. The relative change in c^H then reaches a maximum as well, arriving at the extremely large value of (c_sat^H−c_min^H)/c_min^H = 4.5 (’’ΔE effect’’). These values are higher than previously reported for Fe₇₈B₁₂Si₁₀, which were at that time the highest known^1,2.