Abstract
Co rich CoNiFe thin films of varying thickness were electrodeposited onto 100 μm diameter copper wires. The microstructure, magnetic properties and magnetoimpedance effect of the samples have been investigated as a function of deposition time. All samples show ferromagnetic behavior with no significant change in coercivity values. The samples are found to exhibit higher magnetoimpedance values (80%) at a frequency of 1 MHz. Detailed analysis of high frequency magnetoimpedance and permeability data suggest a strong correlation between soft magnetic and magnetoimpedance behavior. Following these trends a phenomenological model has also been developed to explain the variation of magnetoimpedance as a function of film thickness.
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