Magnetic properties and giant magnetoimpedance effect for CoFeMoSiB surface modified amorphous ribbons covered by water based ferrofluid
University of Birjand, 97175-615, Birjand, Iran
2 Ural Federal University, Mira str., 19, Ekaterinburg, 620002, Russia
3 Institute of Electrophysics, Amundsen str., 106, Ekaterinburg, 620016, Russia
4 Universidad del País Vasco UPV-EHU, Depto Electricidad y Electrónica, Leioa, 48940, Spain
Corresponding author: firstname.lastname@example.org
Published online: 4 July 2018
Giant magnetoimpedance (GMI) effect is a powerful technique for magnetic label detection. Co-based amorphous ribbons are cheap materials showing high GMI effect at low operation frequencies for close to zero magnitostriction compositions. In this work magnetic properties and GMI were studied for CoFeMoSiB amorphous ribbons in as-quenched and surface modified states without and in the presence of water-based ferrofluid with electrostatic stabilization of γ-Fe2O3 nanoparticles. Surface modification by ultrasound treatment resulted in appearance of round defects with average diameter of about 150 micrometers. The GMI difference for as-quenched ribbons in absence and in the presence of ferrofluid was measured for the frequency range of 0.5 to 10 MHz. Although proposed surface modification by the ultrasound treatment did not improve the sensitivity limit for ferrofluid detection, it did not decrease it either. Observed changes of GMI are useful for understanding of functionality of GMI biosensors.
© The Authors, published by EDP Sciences, 2018
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