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MA: Fachverband Magnetismus

MA 35: Spin-Dynamics / Spin-Torque IV

MA 35.15: Vortrag

Donnerstag, 26. März 2009, 19:00–19:15, HSZ 04

Magnetization Dynamics in Interlayer Exchange Coupled Magnetic Microstructures — •Alexander Kaiser, Carsten Wiemann, Stefan Cramm, and Claus M. Schneider — Forschungszentrum Jülich, Institut für Festkörperforschung IFF-9 und JARA-FIT, 52425 Jülich, Deutschland

Photoemission Electron Microscopy (PEEM) combined with soft x-rays with variable polarization and a pulsed time structure offered at modern storage rings is a powerful tool for investigating magnetization dynamics with high spatial and temporal resolution. Tuning the photon energy to the absorption edges of the appropriate elements and exploiting the XMCD effect offers the possibility to probe the micromagnetic structure of different layers in magnetic heterostructures independently. Thus the influence of coupling phenomena on the micromagnetic behavior can be studied in magnetic heterostructures.

We have investigated the magnetization dynamics in interlayer exchange coupled CoFe/Cr/NiFe structures for different Cr thicknesses spanning parallel, antiparallel and 90^∘-coupling of the ferromagnetic layers. The films have been grown epitaxially by MBE on GaAs substrates with Ag buffer layers. We present time-resolved PEEM measurements of the magnetodynamic response on a short magnetic field pulse in both ferromagnetic films. The influence of the interlayer exchange coupling on the magnetodynamic behaviour will be discussed.

This work was supported by the DFG within SFB 491.