Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Magnetic Imaging

MA 32.8: Vortrag

Freitag, 30. März 2007, 12:45–13:00, H22

Spin-resolved photoelectron microscopy of magnetic nanostructures — •R. Ovsyannikov, F. Kronast, H. A. Dürr, and W. Eberhardt — BESSY GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany

Magnetic nanostructures are at the heart of modern data storage technology. Typical dimensions of magnetic bits are in the sub-100nm region. In addition novel magnetoelectronics devices such as magnetic random access memory junctions are operated on the sub-µm scale. An understanding magnetic properties of such low-dimensional structures is only accessible to spectro-microscopy tools capable of appropriate lateral resolution. A new nanospectroscopy end-station at BESSY aims for that goal by combining a novel spin-resolved photoemission microscope (SPEEM) with a dedicated microfocus beamline with full x-ray polarization control. The end-station is equipped with a commercial PEEM (Elmitec GmbH) capable of 20nm spatial resolution for synchrotron light excitation. Two Mott polarimeters allow analysis of all three photoelectron spin components with sub-µm lateral resolution. The spin-polarization provides complementary information which is not accessible to the x-ray circular dichroism, e.g. the spin polarization at the Fermi level. Such information will be especially interesting for systems which are predicted to be half-metallic. In this talk we will present this unique instrument and give several commissioning results on soft magnetic alloys and nanostructures.