Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Micro Magnetism / Computational Magnetism

MA 19.7: Vortrag

Mittwoch, 25. März 2009, 11:45–12:00, HSZ 403

Propagation of spin waves through domain walls in Permalloy thin-film wires: scattering and interference — •Ming Yan, Sebastian Gliga, Riccardo Hertel, and Claus Schneider — Research Centre Jülich, Institute of Solid State Research, 52425 Jülich

The influence of domain walls on propagating spin waves is of great interest to both fundamental physics and potential applications in novel logic devices [1]. Using a finite-element micromagnetic code, we simulate the propagation of monochromatic spin waves through transverse and vortex walls formed in Permalloy thin-film wires. At lower frequencies, the planar waves propagate through the domain walls without being noticeably scattered. A phase shift, however, is induced by the domain walls as reported in Ref. [1]. At higher frequencies, periodic interference patterns are generated after the planar waves have been scattered by the domain walls. These patterns can be understood in terms of self-interference of the scattered waves or, alternatively, as the superposition of the original planar wave and the allowed transmission modes for the magnetic strip acting as a waveguide. These modes are quantized along the width direction of the wire and can be either symmetric or anti-symmetric with respect to the central wire axis. Similar interference effects of spin waves have also been observed recently in transversely magnetized wires without domain walls [2].

References [1] R. Hertel, W. Wulfhekel, and J. Kirschner, Phys. Rev. Lett. 93, 257202 (2004) [2] V. E. Demidov, S. O. Demokritov, K. Rott, P. Krzysteczko, and G. Reiss, Phys. Rev. B 77, 064406 (2008)