Giant magneto-impedance effect in composite wires

Using electroless deposition, the composite wires with ferromagnetic core and conductive core were produced. The properties of GMI were investigated, the composite wires with ferromagnetic core obtained the maximum 107% at f = 60MHz, and the composite wires with BeCu core obtained the maximum 108% at f = 300kHz. An obvious MR effect is observed in the CuBe/insulator/NiCoP composite wires at lower frequency, then R and X make comparative contribrtion to the total MI ratio. The results show that MI ratio is dependent not only on the values of and but also on the ratio between R and X, so the obvious MI effect can be observed not only soft magnetic properties but also lower resistivity.