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MA: Fachverband Magnetismus

MA 41: Micromagnetism / Computational Magnetics

MA 41.3: Vortrag

Mittwoch, 22. März 2017, 15:30–15:45, HSZ 101

Reconfigurable nano-scale spin-wave directional coupler — •Qi Wang¹, Philipp Pirro¹, Roman Verba², Andrei Slavin³, Burkard Hillebrands¹, and Andrii V. Chumak¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern 67663, Germany — ²Institute of Magnetism, Kyiv 03680, Ukraine — ³Department of Physics, Oakland University, Rochester, MI 48309, USA

Spin-wave wavelengths are orders of magnitude smaller than those of electromagnetic waves of the same frequency, and thus, allow for the design of nano-scaled devices for processing of analog as well as digital data. Crossing structures are a prerequisite for the realization of complex integrated two-dimensional spin-wave circuits. A simple X-type crossing does not satisfy the requirements at the nanometer scale. In this work, we study the coupling of spin waves in parallel- and anti-parallel-magnetized nano-scaled waveguides with a gap using micromagnetic simulations. A corresponding analytic theory is developed. The insulator material yttrium iron garnet (YIG) is studied due to its intrinsically low spin-wave damping. Our results show that a spin wave excited in one waveguide transfers all its energy into the second waveguide after the propagation of a certain distance. This can be utilized to cross two magnonic conduits without interaction, as a power divider, or as a frequencies separator.

This research has been supported by ERC Starting Grant 678309 MagnonCircuit.