Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.8: Poster
Dienstag, 26. Februar 2008, 15:15–18:30, Poster E
Magnetic domain imaging of Co/Pt multilayers by soft x-ray holography — •Carsten Tieg1, Robert Frömter2, Christian Menk2, Holger Stillrich2, Daniel Stickler2, Hans Peter Oepen2, Christian Gutt3, Olaf Leupold3, Simone Streit-Nierobisch3, Lorenz-M. Stadler3, and Gerhard Grübel3 — 1European Synchrotron Radiation Facility, Grenoble, France — 2Institut für Angewandte Physik, Universität Hamburg, Germany — 3Deutsches Elektronen Synchrotron, Hamburg, Germany
Soft x-ray holography is a promising technique for magnetic domain imaging. This diffractive imaging technique is based on the interference of resonantly tuned soft x-rays through an ion beam patterned sample-mask assembly. Magnetic contrast is achieved by using the x-ray magnetic circular dichroism effect at the L3 absorption edges of 3d metals. Magnetic domain images are reconstructed by a Fourier transform of the difference of two diffraction patterns recorded by illuminating the sample with coherent circularly polarised light of opposite helicities. We have adapted the concept to the beamline ID08 at the ESRF. Several design parameters like size and number of reference pinholes, size of beam-defining primary pinhole, and the sample to CCD sensor distance were systematically varied in order to study their effect on magnetic contrast and resolution. We present magnetic domain images of Co/Pt multilayer films prepared by sputtering onto a silicon nitride membrane. Applying an out-of-plane magnetic field we imaged the magnetic domain structure throughout the full hysteresis loop of a 8×[Co(0.7nm)/Pt(1.0nm)] multilayer system.