Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.59: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Giant magnetoimpedance of composite wires with an insulation layer — Ralf Betzholz¹, •Haibin Gao¹, Zhenjie Zhao², and Uwe Hartmann¹ — ¹Institute of Experimental Physics, Saarland University, P.O. Box 151150, D-66041 Saarbruecken, Germany — ²Department of Physics, East China Normal University, 3663 Zhongshan North Road, 200062 Shanghai, P.R. China

Composite wires with a three-layered structure were investigated with regard to the origin of the giant magnetoimpedance (GMI) effect. The samples consisting of a copper core, a silicon dioxide layer and an outer Permalloy shell were prepared by RF magnetron sputtering. The GMI ratio was measured at various driving current frequencies and with different insulating layer thicknesses. A theoretical model based on coupling the Maxwell equations to the Landau-Lifschitz-Gilbert equation was developed to investigate the composite wire impedance and its dependence on external magnetic field, current frequency and insulating layer thickness. Reasons for discrepancies between the theory and experimental findings were discussed.