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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.24: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Parametric excitation of spin wave dynamics in a Permalloy nanoellipse — •Philipp Seibt¹, Henning Ulrichs¹, Vladislav Demidov¹, Sergej Demokritov¹, and Sergei Urazhdin² — ¹Institut für Angewandte Physik, Universität Münster, Corrensstraße 2-4, 48149 Münster, Germany — ²Department of Physics, Emory University, Atlanta, GA 30322, USA

The excitation of spin waves with a desired spatial structure is of both fundamental interest and key importance for designing devices utilizing spin dynamics. Parametric excitation is a non-linear process that can access a wide range of spin wave modes. Here we investigate using micro-focus Brillouin light scattering spectroscopy parametrically excited spin waves in a Permalloy nanoellipse. We show that modes localized at the edges of the ellipse have an anomalous spatial distribution and a significantly higher excitation threshold compared to modes localized at the center. We are able to qualitatively explain these results using micromagnetic simulations. Our work demonstrates that certain spin wave modes are highly sensitive to small deviations in sample properties such as saturation magnetization and thickness.