Giant Magnetoimpedance Effect of Magnetically Soft Microwires
for Sensor Applications
Abstract
Studies of Giant magnetoimpedance, GMI effect have attracted considerable attention in the last few years owing to it suitability for sensor applications. The origin of the GMI effect is interpreted in terms of the skin effect of a magnetic conductor, assuming the dependence of the penetration depth of an AC current flowing through a soft magnetic conductor on the DC applied magnetic field. The extremely high sensitivity of the GMI effect even to weak magnetic fields has generated great interest for development of cost-effective, high-performance magnetic sensors. The recent trend towards miniaturization of devices has stimulated the development of thin (a few micrometers in diameter) magnetically soft amorphous microwires. In this paper we present our recent experimental results on influence of preparation and processing conditions on magnetic properties and GMI effect of Fe- and Fe-Co based glass-coated microwires. Excellent soft magnetic properties and GMI ratio up to 650 % have been obtained in properly processed low magnetostrictive Co-rich microwires. Although less expensive Fe-rich microwires exhibit rather high magnetostriction coefficient and consequently quite low GMI effect, magnetic softness and GMI effect can be substantially improved by appropriate processing. In both Fe and Co-rich microwires the maximum GMI ratio is observed for frequencies above 100 MHz.
Brief Biography
Dr. Arcady Zhukov received Ph.D. degree from the Institute of Solid State Physics (Chernogolovka) of the Russian Academy of Science, Doctor of Science (habilitation) in Moscow State 'Lomonosov' University. Present employment: Ikerbasque Research professor at the University of Basque Country, Spain. He has published more than 600 referred papers in the international journals, 4 books and more than 20 book chapters (total citations number 9541, Citation H-index 54(WOS)/ 12421 and H=61 (Google scholar)). A. Zhukov, edited conference proceedings, chaired Donostia International Conference on Nanoscaled Magnetism (DICNMA), III Joint European Magnetic Symposia, 24th International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM' 2017), etc., several sessions at various Conferences, gave a number of plenary, keynote and invited talks at several international conferences. He is an associate Editor of IEEE Magnetic Letters and International Journal on Smart Sensing and Intelligent Systems, member of several editorial boards and committees of International Conferences (MMM, Intermag…).