Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Magnetic Materials

MA 13.4: Vortrag

Montag, 26. März 2012, 15:45–16:00, H 0112

Magneto-impedance of Permalloy nanowires — •Saleh Getlawi, Haibin Gao, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, P.O. Box 151150, D-66041, Saarbrücken, Germany

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 discuss the MI effect of Permalloy nanowires. Nanowires with a length of 20 micrometer and a width of 300 nm were prepared by electron beam lithography (EBL) and focused-ion-beam (FIB)-based methods. The nanowires were placed into a microwave transmission line consisting of two gold microstrip lines with 50 ohm characteristic impedance. The impedance of the Permalloy nanowire has been measured up to 3 GHz within a field up to 30 mT. When the frequency is far above the ferromagnetic resonance (FMR), the obtained impedance change is less than 1% due to the small effective permeability.