Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 36: Micro- and Nanostructured Magnetic Materials III

MA 36.7: Vortrag

Mittwoch, 16. März 2011, 16:15–16:30, HSZ 103

Magnetoimpedance of Permalloy nanowires — •Saleh Getlawi, Haibin Gao, Michael Koblischka, and Uwe Hartmann — Inst. of Experimental Physics, Saarland University, P.O. Box 151150, 66041 Saarbrücken

The magneto-impedance (MI) effect was studied extensively on amorphous wires, ribbons, and on multilayer thin films. This effect involves huge changes of the complex impedance of soft magnetic materials upon applying an external magnetic field. In this contribution we explore the MI effect on Permalloy nanowires. Nanowires of lengths of 40-60 mu and widths of 200-400 nm were prepared by electron beam lithography (EBL) and a lift-off process. Electrodes for the transport measurements and platinum contacts were fabricated by focused-ion-beam(FIB)-based methods. Magnetic force microscopy (MFM) was employed to observe the magnetic domain structures of the nanowires. For high frequency measurement, the sample was placed on a microwave transmission line consisting of two gold microstrip lines. MI measurements were performed in the range from 10 MHz to 3 GHz.