Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Magnetization / Demagnetization Dynamics II
MA 23.2: Vortrag
Mittwoch, 28. März 2012, 10:00–10:15, H 1012
Bending spin waves around the corner — •Katrin Vogt1,2, Helmut Schultheiss3, Shikha Jain3, Axel Hoffmann3, and Burkard Hillebrands1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, D-67663 Kaiserslautern, Germany — 2Graduate School of Excellence Material Science in Mainz, Staudinger Weg 9, D-55128 Mainz, Germany — 3Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
The guidance of spin waves in more complicated geometries than simple waveguide strips is a challenge in realizing magnonic devices. Especially in metallic magnetic materials like Permalloy (Ni81Fe19), where the length scales are of interest for applications, it will be inevitable to find means how to accomplish truly two-dimensional spin-wave propagation.
Using Brillouin light scattering microscopy, we have studied the propagation of spin waves in Permalloy microstrips exhibiting a smooth bend. We will discuss the use of a direct current flowing through a gold wire underneath the Permalloy to provide a local magnetic field and maintain a transverse magnetization around the bend of the waveguide. We will demonstrate how spin-wave propagation around the bend is improved compared to the case of an externally applied magnetic field which generates strong inhomogeneities in the internal magnetization distribution and prevents any spin-wave propagation around the bend.
Financial support by the Carl-Zeiss-Stiftung is gratefully acknowledged.