Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.12: Poster
Friday, March 18, 2011, 11:00–14:00, P2
X-ray holographic imaging of dot patterned perpendicular magnetic structures — •Felix Büttner1,2,5, Christoforos Moutafis1,2,3, Jan Rhensius1,3, André Bisig1,2,3, Bastian Pfau5,6, Christian Günter6, Carsten Tieg6, Jyoti Mohanty5, Stefan Schaffert5, Samuel Flewett5, Hermann Stoll4, Laura Jane Heyderman1, Mathias Kläui1,2,3, and Stefan Eisebitt5,6 — 1Paul Scherrer Institut, 5232 Villigen, Switzerland — 2LNSD, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland — 3Universität Konstanz, 78457 Konstanz, Germany — 4MPI für Metallforschung, 70569 Stuttgart, Germany — 5Technische Universität Berlin, 10623 Berlin, Germany — 6HZB, 12489 Berlin, Germany
Dot patterned magnetic data storage media with perpendicular magnetic anisotropy (PMA) are among the most promising candidates for future storage technology that is threatened by the superparamagnetic limit in conventional hard disk media. There is therefore industrial and fundamental scientific interest for dynamic and static imaging of spin structures in these materials. Of particular interest are domain wall movement and domain switching processes. X-ray holography is a well suited imaging technology due to the immunity to drift, the absence of any cross talk between the excitation system and the imaging system and due to the perspective to take single shot time resolved images at free electron lasers. We present first holographic images of PMA material disks. The image quality was considerably improved by an advanced reconstruction algorithm accounting for finite gaps in the path of the x-rays.