Joule Heating Preannealing Effect in the Coercivity Field and Magnetostriction Constant of Co₆₆Fe₄Mo₂Si₁₆B₁₂Alloy

Abstract

The effect of thermal treatments (by the Joule heating and conventional annealing) on the coercivity and saturation magnetostriction constant in the amorphous and nanocrystalline Co66Fe4Mo2Si16B12 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 I.5 x 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).