Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Magnonics
MA 8.8: Vortrag
Montag, 1. April 2019, 16:45–17:00, H52
Unidirectional spin wave propagation in a magnetic bilayer system — •Moritz Geilen1, Matías Grassi2, Morteza Mohseni1, Yves Henry2, Thomas Brächer1, Damien Louis2, Michel Hehn3, Matthieu Bailleul2, Burkard Hillebrands1, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Germany — 2Institut de Physique et Chimie des Matériaux de Strasbourg, CNRS and Université de Strasbourg, Strasbourg, France — 3Institut Jean Lamour, Université de Lorraine, UMR 7198 CNRS, 54506 Vandoeuvre-lés-Nancy, France
We present the realization of a magnonic diode based on a magnetic bilayer system, which allows spin wave propagation effectively only in one direction. Spin waves traveling perpendicular to the static magnetization intrinsically show a non-reciprocal propagation. But as long as both surfaces of the film are equal and the film itself has homogenous material parameters across its thickness, the frequencies of counter-propagating spin waves are degenerate. This symmetry is broken in a magnetic bilayer system leading to a frequency shift between counter-propagating spin waves with the same wavelength, while leaving the good propagation characteristics of the materials unharmed. This non-reciprocal behaviour is studied in a CoFeB/Py bilayer film using wave-vector resolved Brillouin light scattering spectroscopy (BLS) and micromagnetic simulations. The spin wave propagation in the microstructured device is measured using BLS microscopy. It reveals unidirectional spin-wave propagation in a wide frequency range.