JOULE HEATING PREANNEALING EFFECT IN THE COERCIVITY FIELD AND MAGNETOSTRICTION CONSTANT OF Co_66Fe_4Mo_2Si_16B_12 ALLOY

摘要

The effect of thermal treatments (by the Joule heating and conventional annealing) on the coercivity and saturation magnetostriction constant in the amorphous and nanocrystalline Co_66Fe_4Mo_2Si_16B_12 alloy is reported. It is noticeable the near insensibility to the external stress of coercive field and anisotropy field (leading to extremely low value of magnetostriction 1.5 × 10~(-8)) achieved after the Joule heating by two steps (first one to relax the internal stresses and the second one to develop a fine nanocrystalline structure).