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KR: Fachgruppe Kristallographie

KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)

KR 5.37: Poster

Dienstag, 15. März 2011, 10:45–13:00, P2

Correlation between lancet domains and misorientation in FeSi sheets with Goss texture — •Jörg Fankhänel, Felix Kurth, Konrad Güth, Ludwig Schultz, and Rudolf Schäfer — IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, D-01171 Dresden, Germany

For transformer cores, mostly Iron-Silicon-sheets with Goss texture are used. For ideal grain orientation, one of the easy <100> crystal axis is aligned along the rolling direction, while the other two are at angles of 45^∘ with respect to the rolling direction. The magnetic performance strongly depends on the misorientation angle, i.e. the angle between the near-surface easy axis and the sheet surface. Earlier work [1] has shown that this angle correlates with the density of lancet domains, a supplement domain structure that is observed for surfaces with small misorientation and which is formed to minimize the magnetic stray-field energy. In this work we want to verify this correlation and determine the experimental conditions for a reliable determination of the misorientation angle from the lancet domain density. To achieve this we directly measured the misorientation angle by means of EBSD (electron backscatter diffraction) and cross correlate them to the lancet pattern (observed by Kerr microscopy) by application of an external magnetic field at a small angle with respect to the rolling direction. Thus the quantification of misorientation and texture degree in Goss sheets by means of Kerr microscopy is an easy to implement and fast alternative to expensive methods like EBSD or x-ray analysis.

[1] N. Bär, A. Hubert, W. Jillek , J. Magn. Magn. Mat. 6, 242 (1977)