Dresden 2011 – scientific programme
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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 63.90: Poster
Friday, March 18, 2011, 11:00–14:00, P2
Detection of Spin-Wave Modes in Microscopic Magnetic Ellipses by Means of Dynamic Scanning Near-field Optical Microscopy — •Johann Jersch1, Vladislav E. Demidov1, Harald Fuchs2, and Sergej O. Demokritov1 — 1WWU Münster, Institut für Angewandte Physik — 2WWU Münster, Physikalisches Institut
Development of spintronic nano-devices demands a direct knowledge about spin dynamics in magnetic nanostructures. Recent achievements in nano-optics have allowed development of scanning near-field optical microsopes with a lateral resolution below 50 nm. Here we present a novel setup based on near-field Brillouin light scattering spectroscopy. This setup allows detection and mapping of spin-wave dynamics simultaneously with the imaging of the topography of the studied nano-element. The lateral resolution achieved is of below 60 nm. The technique is also applicable for near-field Raman, acoustic and fluorescence spectroscopies. A mapping of spin-wave dynamic modes in in-plane magnetized permalloy micro-ellipses was carried out. Both center and strongly localized edge modes were observed and studied. The localization width of the edge modes depends on the applied magnetic field and reduces to about 85 nm for high fields.