Saturation Magnetostriction and Volume Magnetostriction of Amorphous Ribbons Based on Fe-Ni and Fe-Co

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The saturation magnetostriction and the forced volume magnetostriction of Fe-Ni and Fe-Co amorphous ribbons were measured from 77°K to room temperature by a three terminal capacitance method. It was found that the magnetostriction was nearly isotropic. In Fe-Ni amorphous system, the saturation λ_s and the volume magnetostriction constants δω/δH decreased monotonously with the increase of Ni concentration from 31×10^<-6> and 21×10^<-10>/Oe respectively for Fe_<0.80>P_<0.13>C_<0.07> to 15×10^<-6> and 7×10^<-10>/Oe respectively for Fe_<0.40>Ni_<0.40>P_<0.13>C_<0.07>. The temperature dependence of the saturation magnetostriction was not simple decreasing function of the temperature. In Fe-Co system, there was a remarkable change of the sign of the magnetostriction nearly equal to Fe_<0.047>Co_<0.703>Si_<0.15>B_<0.10>.
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