Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Magnetic Materials

MA 13.1: Vortrag

Montag, 26. März 2012, 15:00–15:15, H 0112

Comparison of x-ray and electron holography using the example of thin magnetic films — •Stefanie Frömmel, Erik Gührs, Tore Niermann, Michael Lehmann, and Stefan Eisebitt — IOAP, Technische Universität Berlin, Germany

We investigated and compared basic principles, prospects and limitations of both electron- and x-ray holography in off-axis geometry for magnetic domain imaging. A Co/Pt multilayer film served as a sample with perpendicular magnetic anisotropy. There are several methods to display magnetic structures in thin films. In the soft x-ray regime we used the x-ray magnetic circular dichroism (XMCD) as contrast mechanism. XMCD investigations were carried out in Fourier transform holography (FTH) geometry with a sample-integrated mask, which provided apertures for object and reference beam. In transmission electron holography we utilized the Aharonov-Bohm effect to generate magnetic contrast. An electrostatic biprism was employed to let the object and reference beam interfere coherently. Advantages and disadvantages of both approaches with respect to spatial resolution and quantitative magnetization determination are discussed.