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 40.93: Poster

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

Anisotropy dependence of domain structure and magnetization dynamics in magnetic thin film elements — •Claudia Patschurek, Jeffrey McCord, Rainer Kaltofen, Rudolf Schäfer, and Ludwig Schultz — IFW Dresden, Inst. f. Metallische Werkstoffe, Helmholtzstr. 20, 01069 Dresden

Patterned multilayered samples of polycrystalline Ni81Fe19 and amorphous Co60Fe20B20 with and without a 5 nm MgO interlayer were deposited under an applied field using dc magnetron sputtering. While the total stack thickness of 80 nm was kept constant, the thickness ratio of the individual layers was systematically varied in order to achieve a linear change of magnetic anisotropy. Static and dynamic properties were investigated by quasi-static magnetometry and pulsed inductive microwave magnetometry (PIMM).

Magneto-optical Kerr microscopy studies reveal that the patterning leads to the formation of characteristic, anisotropy-dependent non-Landau closure domain structures in the non-laminated elements, while no anisotropy dependence is obvious for the domain structure of laminated thin film elements. Irregular contributions to the effective field and thus the dynamic magnetic response, originating from the domain structures, were identified.