Complex Magnetoimpedance in Joule-Heated Co71,1Fe3,9Si10B15 Microwires

E. Komovaa, J. Kozar a, P. Klein b and R. Varga b aFaculty of Aeronautics of Technical University of Kosice, Rampova 7, 041 21 Košice, Slovakia bInstitute of Physics, Faculty of Sciences, P.J. Safarik University, Park Angelinum 9, 041 54 Košice, Slovakia

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Complex magnetoimpedance study is an alternating current technique that can be used to probe some properties of magnetic materials. We report on complex impedance measurements in low-negative magnetostrictive ferromagnetic CoFeSiB microwire. In these wires, the domain structure consists of two parts: an inner core, with domains oriented to the longitudinal direction of the wire, and an outer shell with circumferentially oriented domains. This magnetic structure is modified by AC current flowing through the microwire which produces an additional circumferential magnetic field HΦpand significantly affects magnetic structure inside the wires. The additional circular magnetization process in wires was studied by impedance measurements as a function of the amplitude and the frequency of the AC current after gradual Joule heating. Changes in the magnetization processes are reflected in the real permeability values and loss factor values.

DOI: 10.12693/APhysPolA.131.705 PACS numbers: 75.50.Kj, 81.07.Bc, 75.47.De