Abstract
Longitudinally driven giant magnetoimpedance GMI effect has been measured in Fe73.5Cu1Nb3Si13.5B9 ribbons, and the enhance- ment of GMI effect using magnetoelastic resonance was investigated. The results showed that at a certain driven frequency when magneto- elastic resonance occurred, there was a great enhancement of the im- pedance of the element and MI effect. For the ribbon of 1.0 cm in length annealed at 480°C, the maximum MI ratio of 10 906% was achieved at the frequency of 214 kHz. The maximum sensitivity reached up to 5 155%/Oe, which was almost 40 times higher than that observed in traditional MI measurements. The results demonstrated that the en- hanced magnitude of MI effect mainly depended on magnetoelastic cou- pling coefficient k. © 2009 Society of Photo-Optical Instrumentation Engineers.
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