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 40.79: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

2D approach to the k-vector resolution of the Brillouin light scattering spectroscopy — •Benjamin Jungfleisch, Christian W. Sandweg, Vitaliy I. Vasyuchka, Alexander A. Serga, and Burkard Hillebrands — FB Physik und Forschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

In this poster we report on our progress towards k vector sensitivity using Brillouin light scattering spectroscopy which enables us to detect and resolve the whole range of magnon wave vectors occurring during the formation of magnon gases and condensates. We overcome this challenge by varying the angle of incident light with respect to the orientation of magnetization. The improvement of our approach consists of expanding this k-vector sensitivity to two dimensions such that spin-wave wave vectors oriented both parallel and perpendicular to the external field can be resolved and measured. The proper operation of this setup is demonstrated by showing the results both for directly excited spin waves near the ferromagnetic resonance and for magnons at the lowest energy state of a parametrically driven magnon gas in yttrium-iron-garnet ferrimagnetic film.