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 40.18: Poster

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

Influence of magnetostatic interaction between nanoparticles on the magnetization behavior : Comparison between experiments and simulations — •Srinivasa Rao Saranu, Brook Esseye Anshebo, and Ulrich Herr — Institute of Micro and Nanomaterials,Ulm University,89081 Ulm,Germany

To achieve high density data storage in pattern recording media the particles must arrange as close as possible. Influence of area coverage of the particles on magnetization behavior was studied. Co and Ni nanoparticles were prepared using plasma gas condensation technique. Diameter and area coverage of the particles were measured using SEM. To study the effect of magnetostatic interaction on magnetization behavior, particles was deposited on Si substrate and in-situ covered with Cu film. The area coverage of the particles varied from 3% to 20%. Hysteresis curves for these samples were recorded with field applied in-plane and perpendicular to the substrate using vibrating sample magnetometry (VSM). Co particles with an average diameter of 30nm show ferromagnetic behavior at room temperature. When the coverage exceeds 5 %, the remanent magnetization along the in-plane direction was larger than that perpendicular to the sample, whereas the saturation field was smaller, which can be attributed to the magnetostatic interaction between the particles. In 40 nm Ni particles, similar behavior was observed but effect of magneto static interaction was smaller than for the Co particles. Influence of interactions on switching field distribution of the particles was studied. The results are compared with micromagnetic simulations of suitable model systems.