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MA: Fachverband Magnetismus

MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)

MA 19.94: Poster

Tuesday, March 15, 2011, 10:45–13:00, P2

Spin-Wave Excitations in Three-Dimensional Rolled-Up Permalloy Structures — •Felix Balhorn, Simon Jeni, Sebastian Mansfeld, Cornelius Bausch, Jesco Topp, Wolfgang Hansen, Detlef Heitmann, and Stefan Mendach — Institut für Angewandte Physik Hamburg, Jungiusstr. 11, 20355 Hamburg

The ability to fabricate geometrically well-defined three-dimensional nanoscrolls utilizing a self-organization process [1] gives rise to transforming any planar structure into a cylindric geometry. After rolling up permalloy (Py) structures, the spin dynamics in these systems are investigated by means of broadband microwave absorption spectroscopy.

Rolled-up Py films show several resonances which exist over a broad field range when magnetized along the rolling axis. These resonances are due to the interference of collective spin waves running in azimuthal direction [2]. In transversally magnetized samples the resonances disappear above a certain magnetic field, which is attributed to geometric anisotropy. Here, we present measurements on rolled-up Py films in transversal magnetization geometry and present a model based on the analytic spin wave dispersion relation for rectangular elements given in [3]. The model used in [2] is refined and applied on rolled-up Py stripes, i.e. small ring elements.

Financial support by the SFB668, GrK 1286, and the Cluster of Excellence Nanospintronics is acknowledged.

[1] V. Y. Prinz et al., Physica E 6, 828 (2000); [2] F. Balhorn et al., PRL 104, 037205 (2010); [3] K. Y. Guslienko et al., PhysRevB 68, 024422 (2003)