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MA: Magnetismus

MA 31: Magnetic Measuring Techniques

MA 31.1: Talk

Thursday, March 30, 2006, 16:15–16:30, HSZ 103

GMI effect and anisotropy in soft magnetically coated wires — •J. Velleuer¹, A.G. Munoz², H. Yakabchuk¹, C. Schiefer¹, A. Hackl¹, and E. Kisker¹ — ¹Institut für Angewandte Physik, Heinrich-Heine Universitä Düsseldorf, 40225 Düsseldorf — ²Dept. of Mat. Sci., LKO, University of Erlangen-Nuremberg, 91058 Erlangen

The impedance of soft magnetic microwires strongly depends on an external magnetic field (GMI). Here, we investigate the GMI effect of Cu wires coated with a soft magnetic layer. The layer thickness and the annealing conditions are varied. Depending on these parameters a GMI effect of up to 1100% was observed.

In order to gain further knowledge about the magnetic anisotropy in these wires -besides the GMI effect- the Procopiu effect was also investigated. The Procopiu effect (also known as the inverse Wiedemann effect) manifests itself in the occurrence of an AC voltage on a solenoid wrapped around the wire, when an AC current is flowing through the wire and an external magnetic field is applied.