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Regensburg 2004 – scientific programme

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MA: Magnetismus

MA 26: Mikro- und nanostrukturierte Materialien

MA 26.2: Talk

Thursday, March 11, 2004, 15:30–15:45, H10

Domain observations in nanocrystalline ribbons — •Sybille Flohrer1, Rudolf Schäfer1, Ludwig Schultz1 und Giselher Herzer21Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, P.O. Box 270016, D-01171 Dresden, Germany — 2Vacuumschmelze GmbH & Co. KG, Grüner Weg 37, D-63450 Hanau, Germany

Soft-magnetic nanocrystalline ribbons of the FeCuNbSiB type consist of 10-15 nm wide crystalline grains of ferromagnetic FeSi, which are magnetically coupled by a ferromagnetic metallic glass matrix. The exchange coupling between the two magnetic phases leads to a seemingly uniform magnetic material from the viewpoint of magnetic microstructure.

Kerr-microscopy observations on a variety of Fe73Cu1Nb3Si16B7 ribbons treated under different conditions are presented. Magnetization processes of annealed ring cores with strong and weak permeability are compared, and the domains in ribbons with creep- and magnetization-induced anisotropy have been observed. Differences in the domain behavior between high and low permeability material are explained in terms of the random anisotropy model considering the ratio of average magneto-crystalline and induced anisotropy.

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