Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.45: Poster

Friday, March 27, 2009, 11:00–14:00, P1A

Hard magnetic films on nanoparticle templates: An approach towards patterned and percolated media — •Christoph Brombacher¹, Christian Schubert¹, Andreas Teichgräber¹, Steffen Schulze¹, Michael Hietschold¹, Sara Romer-Urban², Denys Makarov³, Marc Saitner⁴, Christian Pfahler⁴, Alfred Plettl⁴, Paul Ziemann⁴, and Manfred Albrecht¹ — ¹Institute of Physics, TU Chemnitz — ²Nanoscale Materials Science, Empa — ³Department of Physics, University of Konstanz — ⁴Institute of Solid State Physics, University of Ulm

The superparamagnetic limit is one of the main aspects which leads to novel concepts to increase the storage density in magnetic data storage devices. Patterned media, a concept in which a magnetic bit is represented by one specific nanostructure within a perfectly ordered array can be achieved by depositing magnetic materials onto spherical particle arrays. Co/Pt multilayers on nanoparticles, as well post-annealed FePt nanoparticle caps in their L1₀ phase, serve as examples for the creation of single-domain magnetic cap structures and the prospects for application in patterned media will be explored. A percolated medium, where domain-walls are effectively pinned by defect sites can be either created by the deposition of CoPt alloys onto close-packed, or by the deposition of Co/Pt multilayers onto none-close-packed particle arrays. These film systems have been characterized both structurally by XRD and TEM and magnetically by SQUID magnetometry and MFM. The effective pinning of domain-walls was further investigated by in-field MFM.