Abstract
The resistive and reactive components of magneto-impedance (MI) for finemet/copper/finemet sandwiched structures based on stress-annealed nanocrystalline Fe 75Si 15B 6Cu 1Nb 3 ribbons as functions of different fields (longitudinal and perpendicular) and frequencies have been measured and analyzed. Maximum changes of 700% and 450% in the resistive and inductive components of MI, respectively, have been obtained in 30–600 kHz frequency range. These large changes in MI are a direct consequence of the large effective relative permeability due to the closed magnetic flux path in the trilayer structure. The influence of perpendicular bias fields ( H per) in the longitudinal MI (LMI) configuration greatly improves the MI ratios and sensitivities. The maximum MI ratio for the resistive component increases to as large as 2500% for H per∼1 Oe. The sensitivity of the field dependence of resistive component of MI increases from 48%/Oe to 288%/Oe at 600 kHz frequency with the application of H per∼30 Oe. Such high increase in MI ratios and sensitivities with perpendicular bias fields are due to the formation the favorable (transverse) domain structures.
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