Abstract
Based on the frequency dependence and the sensitivity of magneto-impedance to anisotropy, temperature, frequency, and magnetic field were able to co-regulated the impedance signals. In this paper, we used the magneto-impedance technique to characterize the martensitic transformation of Ni46Mn22Ga24Co4Cu4 shape memory microwire. The phase transformation from martensite to austenite at 345–368 K was accompanied by the magnetic transition. There was a significant difference in the magneto-impedance between the two phases that was strongly dependent on the range of the excitation current frequency. Higher magneto-impedance was acquired in martensite with high anisotropy indicating its higher sensitivity to the magnetic field. Additionally, the structure of the martensite variants caused hysteresis in the magneto-impedance and the maximum magneto-impedance ratio of the two phases was obtained at a high frequency (50 MHz). The results of this indicate the potential applicability of magneto-impedance measurement in analyzing phase transformations.
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