Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.85: Poster

Freitag, 18. März 2011, 11:00–14:00, P2

Anisotropic Spin wave propagation in ferromagnetic layers with an inplane magnetic field — •Thomas Kendziorczyk, Julian Hüser, and Tilmann Kuhn — Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

Spin waves are a quickly developing topic and have great potential in application for magnetic nanodevices because of their remarkable property, that the dispersion relation can be very easily tuned by an external magnetic field. In a ferromagnetic layer spin waves can be generated by a spin polarized current through a nanocontact which gives rise to a spin-torque on the spin system in the layer. The propagation process of the spin waves can be theoretically described by the Landau-Lifschitz equation taking into account exchange and dipole interaction for a finite layer thickness. If an external inplane magnetic field is applied the spin waves align themselves perpendicular to the direction of the field. We will show analytical calculations of the dispersion relation and group velocity, that explain this anisotropic behavior, and compare these with micromagnetic simulations.