Magnetostriction and its high frequency magnetic properties for polymer-matrix Re-Fe giant magnetostrictive composites

Polymer-matrix Re-Fe giant magnetostrictive composites were prepared by combining 0-3 type magnetostrictive alloy (Tb_0.3 Dy_0.7 Fe_1.95) and epoxy (E-44). The magnetostriction and high frequency magnetic properties of the composites were studied by using the standard strain gauge technique and Agilent 4294A impedance analyzer. The dependence of permeability，cut-off frequency properties on the frequency and the volume fraction of E-44 was investigated in detail. The results show that the composites have both good dynamic response with a high frequency and magnetostriction properties. The cut-off frequency of composites is higher than 30 MHz，and their magnetostriction is 808×10^-6 and 821×10^-6 when the volume fraction of E-44 is 20% and 30%. The magnetostriction of the composite still keeps to be 592×10^-6 when the volume fraction of E-44 is 50%. The high frequency response mechanism of the magnetostrictive composite was analyzed.