Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 23: Poster session

MM 23.24: Poster

Dienstag, 26. Februar 2008, 14:45–18:00, Poster B

Dependency of magnetic domain structures on stress and field history in bulk NiMnGa — •Ryan Yiu Wai Lai, Jeffrey McCord, Rudolf Schaefer, and Ludwig Schultz — Leibniz-Institute for Solid State and Materials Research, P.O.Box 270116, Dresden D-01171, Germany

A study of the magnetic domain structure in bulk NiMnGa magnetic shape memory single crystals is presented. Polarization microscopy, using a magneto-optical indicator film technique, is employed to obtain the static magnetic domain patterns at all surfaces of bulk crystals. Different complexity of domain patterns is revealed with different twinning states (e.g. single variant state, two-variant state). The dependency of domain patterns with stress and field history is investigated. Domain models explaining the observations will be discussed in detail. Funding through the DFG priority program SPP1239 is gratefully acknowledged.