Dresden 2009 – wissenschaftliches Programm

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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 40.44: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

Fabrication and magnetic properties of CFO films and arrays — •Sven Schnittger¹, Christian Jooss¹, and Sibylle Sievers² — ¹Institut für Materialphysik, Universität Göttingen — ²Physikalisch-Technische Bundesanstalt, Braunschweig

Patterned arrays of magnetic dots are interesting model systems for the study of new types of magnetic ordering due to the competition of intra-dot and inter-dot interactions. Whereas various studies have been performed at arrays of soft magnetic materials with in-plane easy magnetization axis, arrays of materials with perpendicular easy axis and moderate magnetocrystalline anisotropy energy are not well studied. We choose ferrimagnetic cobalt ferrite (CoFe2O4) squares, which have moderate magnetocrystalline anisotropy. Thin film samples were prepared by ion sputtering and patterning was performed by electron beam lithography processes which were adapted to the patterning of highly insulating materials. The structural and magnetic properties of the samples were characterized by scanning electron microscopy, magneto-optical and SQUID measurements, atomic force and magnetic force microscopy. The magnetization distribution of the arrays is analyzed as a function of element shape and distance.