Regensburg 2013 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 12: Poster 1

DF 12.58: Poster

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

Domain-structure-induced giant magneto-impedance — •Matthäus Langosch, Thomas Karwoth, Haibin Gao, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, P. O. Box 151150, D-66041, Saarbruecken, Germany

Recent magneto-impedance studies in the low frequency range up to 100 kHz confirm the GMI effect on <100> iron single crystals (iron whiskers) [1]. In this range, contributions of magnetic domain structures and domain wall dynamics have to be taken into account. Compared to optimized GMI samples like amorphous Co-based microwires, iron whiskers have cubic magneto crystalline anisotropy and the GMI effect shows a strong current dependence. The dependence is related to the Oersted-field-induced domain structure when the current is in the order of tens of mA. The magnitude and the phase of the effective circumferential permeability, obtained through calculations based on the standard skin effect formalism and the experimental data, show various magnetic field and current frequency regimes. Further experimental investigations including magneto-optical Kerr effect microscopy and pickup-coil measurements give a deeper insight in these GMI regimes.
[1] M. Langosch, H. Gao and U. Hartmann J. Phys. D: Appl. Phys. 45, 085001 (2012)