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MA: Fachverband Magnetismus

MA 54: Spin Excitations I

MA 54.2: Talk

Thursday, March 17, 2011, 15:15–15:30, HSZ 04

Magnetization reversal process in Permalloy nanostructures — Markus König, Saleh Getlawi, •Haibin Gao, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, P.O.Box 151150, D-66041 Saarbrücken, Germany

The understanding and control of the displacement and motion of magnetic domain walls (DW) induced by a magnetic field or a spin-polarized current is of great interest due to potential applications such as magnetic memory devices. Permalloy (Ni81Fe19) nanowires with various pad geometries for DW propagation and optimized geometries for DW nucleation and annihilation were fabricated by electron beam lithography (EBL) and focused-ion-beam (FIB) methods. The actual dimensions of the structures were determined by SEM and AFM. The DW was imaged using MFM before, during and after applying an in-plane one- or two-dimensional magnetic field. Results show that switching fields strongly depend on the nanowire widths and the pad geometries. Micromagnetic simulations by OOMMF were performed for comparison to determine the primary domain structure as well as the DW displacement and the switching field. Theoretical and experimental results are in fairly good agreement.