Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 23: Magnetization / Demagnetization Dynamics II

MA 23.10: Talk

Wednesday, March 28, 2012, 12:15–12:30, H 1012

Lifting the Degeneracy of Spin Wave Resonances in Three-Dimensional Rolled-Up Microtubes — •Felix Balhorn, Cornelius Bausch, Lennart Moldenhauer, Wolfgang Hansen, Detlef Heitmann, and Stefan Mendach — Institut für Angewandte Physik Hamburg, Jungiusstr. 11, 20355 Hamburg

Nowadays, the established methods of nano-sized sensors, integrated circuits or storage devices are mostly based on two-dimensional fabrication technologies. In strong contrast to those planar nanostructures, the concept of self-rolling strained layers [1] holds the opportunity to prepare and study three-dimensional functionalized devices. We recently demonstrated that strained semiconductor/Permalloy layers can be rolled-up into three-dimensional microtubes which exhibit azimuthal spin-wave resonances and act as magnetically tunable filters for the GHz regime [2].

In this talk, the dynamic properties of these structures obtained via broadband-microwave absorption spectroscopy are discussed. We focus here on an experiment where the axis of the rolled-up microtube is oriented parallel to the signal line of our waveguide. The position of the rolling edge is varied with a micromanipulator to optimize the excitation efficiency. A characteristic frequency splitting of resonant modes in external magnetic fields is observed. We gratefully acknowledge support by the DFG via SFB 668, GrK 1286, and by the city of Hamburg via the Cluster of Excellence Nano-Spintronics.

[1] V. Y. Prinz et al., Physica E 6, 828-831 (2000); [2] F. Balhorn et al., PRL 104, 037205 (2010)