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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.43: Poster

Freitag, 26. März 2010, 11:00–14:00, Poster B1

Improved spin-SEM for high quality imaging of magnetic structures — •Fabian Lofink, Sebastian Hankemeier, Robert Frömter, and Hans Peter Oepen — Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany

The unique feature of spin-SEM is the fact that it gives direct access to the magnetization orientation at the surface of a ferromagnetic sample. The high surface sensitivity allows for the investigation of ultrathin samples down to the monolayer regime. The latter property is often advantageously used when contaminated samples are to be investigated. In this case dusting with ultrathin ferromagnetic material is utilized to mirror the magnetic structure in the clean ferromagnetic film to make the magnetic structure accessible for spin-SEM. In this poster we present a new design of a spin-SEM where the LEED-detector performance is optimized with respect to the properties of underlying physics, the secondary electron emission process. The secondary electron emission process determines the energy and polarization distribution of electrons that are used for the imaging. With the improvement it is possible to take overview images in less than a minute and high quality images within 5-10 minutes. The simulated properties are compared to the results of experimental investigations. A very good agreement is found proving the optimized working condition in our set up.