Kolloquiumsvortrag, Dr. Sebastian Wintz, Paul Scherrer Institute Villingen, Switzerland / 11.07.2016

11.07.2016 von 17:15 bis 18:45

Institut Ostufer, Kaiserstraße 2, 24143 Kiel, Raum: Geb. D, "Aquarium"

Titel: "Topological Spin Textures as Spin Wave Emitters"

Abstract:

Today, spin waves are seen as high potential information carrier for next-generation information and communication devices [1]. This view is based on the substantially reduced energy dissipation and much smaller wavelengths of spin waves compared to traditional charge current signals. For the implementation of spin wave technology into applicable devices, however, novel concepts for the generation, manipulation, and detection of spin waves are yet to be found. With respect to spin wave generation, it was typically necessary to either use patterned transducers with sizes on the order of the desired wavelengths (striplines or point-contacts), or to generate those spin waves parametrically by a double-frequency spatially uniform microwave signal [2]. In this presentation, I will report on a newly discovered concept for the generation of spin waves, which overcomes the bandwidth limitations in terms of the minimum wavelength limit given by the patterning size. This method utilizes the translation of natural topological defects, namely the gyration of magnetic vortex cores to generate isotropically propagating,  non-reciprocal  spin  waves  [3].  Experimentally,  such  spin-waves  were directly  observed  by  means  of  time-resolved x-ray  microscopy. Furthermore, I  will address directional and one-dimensional spin wave emission in anistropic magnetic systems.

[1] D. Rosso, “International Technology Roadmap for Semiconductors Explores Next 15

Years of Chip Technology”, www.semiconductors.org, (2014).

[2] A. G. Gurevich and G. A. Melkov, Magnetization Oscillations and Waves. New York: CRC, 1996.

[3] S. Wintz et al., submitted (2015).

Today, spin waves are seen as high potential information carrier for next-generation information and  communication devices.  This  is  based  on  the  substantially reduced energy dissipation and much smaller wavelengths of spin waves compared to traditional charge current signals. For a device implementation, however, novel concepts for the generation, manipulation, and detection of spin waves are yet to be found. Here, we report on a newly discovered concept for the generation of spin waves, which overcomes typical bandwidth limitations of traditional spin wave excitation methods. Our approach utilizes the  gyration  of  magnetic  vortex  cores  to  generate  isotropically  propagating,  non- reciprocal spin waves.

 

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