Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)
MA 40.72: Poster
Freitag, 27. März 2009, 11:00–14:00, P1A
Tunneling of spin waves through a mechanical gap — •Thomas Schneider1, Alexander A. Serga1, Andrii V. Chumak1, Mikhail P. Kostylev2, and Burkard Hillebrands1 — 1FB Physik und Forschungszentrum Optimas, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 2School of Physics, M013, University of Western Australia, Crawley, WA 6009, Australia
We report on the investigation of spin-wave tunneling through a mechanical gap. Tunneling in this case happens due to the long range dipolar field created by the spin waves. Experiments were performed in yttrium iron garnet waveguides where gaps of different sizes were created perpendicular to the waveguide axis by chemical etching. Spin-wave excitation was performed using microwave pulses that were applied to a microstrip transducer. Brillouin light scattering spectroscopy as well as a conventional microwave technique were used to detect the spin waves. The use of two microstrip antennas allowed us to simultaneously observe the spin waves that tunnel through the gap as well as a reference spin wave that propagates in the continuous part of the same sample. By comparing the intensities of this two waves one can precisely determine the tunneling transmission coefficient. Realizing interference between them provides the possibility to measure the additional phase shift induced by the tunneling process.
Financial support by the DFG (Graduiertenkolleg 792 and SE 1771/1-1) and the Australian Research Council is gratefully acknowledged.