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MA: Fachverband Magnetismus

MA 13: Magnetic Materials II

MA 13.7: Talk

Monday, March 14, 2011, 18:30–18:45, HSZ 401

The AC transport properties of iron whiskers at 4.2 K — •Matthäus Langosch, Haibin Gao, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, Postfach 151150, D-66041, Saarbruecken, Germany

Iron single crystals (iron whiskers) were grown as specific samples to investigate the magneto-impedance (MI) effect at low temperature. MI measurements on iron whiskers with <100> growth direction were first carried out at room temperature. The MI effect of the whiskers was observed as a function of driving current and frequency. Calculations based on the standard skin effect formalism provide the complex values of the effective circumferential permeability. Furthermore, MI measurements at low temperature were employed to investigate the AC transport properties. In addition, DC measurements were carried out to extract magneto-resistance (MR) effects from the MI data. At room temperature, the change of the impedance is about 150 % and mainly due to the skin effect. At low temperature, MR effects are taken into account.