Abstract
The effect of annealing conditions on the effective magneto-mechanical coupling factor, Young’s modulus at constant external magnetic field and constant induction (cH and cB), 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 keff is relatively small in F80B20 and Fe80B10Si10. It results in keff 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 keff 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 cH then reaches a maximum as well, arriving at the extremely large value of (csatH−cminH)/cminH = 4.5 (’’ΔE effect’’). These values are higher than previously reported for Fe78B12Si10, which were at that time the highest known1,2.
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