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Elevated giant magneto-impedance in amorphous metallical co-dased alloys

Poperenko L. V., Manko D. Y.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 4

12-14

This paper reviews results of an enhancement of giant magneto-impedance (GMI) in cobalt-rich amorphous glassy alloys. There are several ways of GMI increasing, namely: thermal, cryogenic and laser treatment. The results are explained via structural changes of ribbons surface and magnetio-optical properties. This phenomenon is interpreted via classical electromagnetic terms. The role of a conductive intermediate film in three-layer sandwich structures is also revealed. Such structure consisting of two cobalt-based ferromagnetic films and a conductive inner film of amorphous nickel shows significant increase of GMI ratio in comparison to a single layer. GMI enhancement makes possible to create new types of high sensitive magnetic field sensors. The investigation of evaluation processes after the ribbons treatment substantiates to clear understanding the nature of GMI.

Formation of Protective Coating on Amorphous Metallic Surfaces by Controlled Adsorption of Functional Oligoperoxides from Aqueous Solutions

Kovbuz M. O., Hertsyk O. M., Mitina N. E., Khimyak Y. Z., Bednarska L. M.

Polish Journal of Chemistry

2008

Vol. 82, nr 1-2

93-100

Formation of nanostructured functional coatings from water solutions of carbon-chain oligoperoxide surfactants (OPS) composed of vinyl acetate (VA), 2-tert-butylperoxy- 2-methyl-5-hexen-3-yne (VEP), maleic anhydride (MA) and oligoperoxide metal complexes of (OMC) with different contents of coordinated Cu2+ and Fe3+ cations on the Fe78.5Ni1.0Mo0.5Si6.0B14.0 and Fe73.1Cu1.0Nb3.0Si15.5B7.4 amorphous alloys (AMA) has been studied. The existence of several stages of the coating formation depending on oligoperoxide nature and the solution concentration has been established. The nature and concentration of oligoperoxides define the structure and packing density of oligomer molecules in the adsorption layers. The oligomer films coordinated by Cu2+ on the Fe78.5Ni1.0Mo0.5Si6.0B14.0 and Fe73.1Cu1.0Nb3.0Si15.5B7.4 AMA are more rigid.