Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 8: Spindynamik I

MA 8.10: Vortrag

Freitag, 4. März 2005, 17:30–17:45, TU H1028

Thickness dependent magnetization dynamics of Permalloy elements observed by time-resolved wide-field Kerr microscopy — •Andreas Neudert, Jeffrey McCord, Rudolf Schäfer, and Ludwig Schultz — IFW Dresden, Helmholtzstr. 20, 01069 Dresden

We investigated the magnetization dynamics of 10 to 160 nm thin Permalloy elements using time-resolved wide-field Kerr microscopy (lateral resolution 0.3 µm, temporal resolution 20 ps). The ferromagnetic structures with lateral sizes of some ten micrometers are deposited onto a coplanar waveguide to excite them with in-plane pulsed magnetic fields produced by a standard voltage pulse generator. Due to the varying film thickness the internal domain wall structure changes (Neel, crosstie, Bloch wall) and the influence onto the magnetization dynamics will be discussed.

This work is funded by the DFG Schwerpunktprogramm 1133 "Ultrafast magnetization processes".