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- W2010294214 abstract "By means of the magneto-optical Kerr effect the domain configuration in Co5Sm-crystals is investigated in dependence on the applied magnetic field. The observed change of the domain structure is interpreted in terms of a micromagnetic theory for the magnetization curve of uniaxial single crystals. The displacement of domain walls took place at an initial field of 265 Oe which is interpreted as the intrinsic coercive field due to the Peierls potential and randomly distributed lattice defects. The density of the interaction energy per extension of the wall is determined to be documentclass{article}pagestyle{empty}begin{document}$ E_0 sqrt {rho /L} = 30,erg/cm^4 $end{document} in the case of a rigid wall. The nucleation of reversed domains is observed in the phase boundary between precipitate and matrix. Furthermore precipitates in grain boundaries are found to act as sources of nucleation centres. These results are interpreted by the nucleation of reversed domains in regions of low crystal anisotropy or of irregular precipitate-surface. Mittels des magnetooptischen Kerreffekts wird die Domänenstruktur in Co5Sm-Kristallen in Abhängigkeit vom äußeren Magnetfeld untersucht. Die beobachtete Änderung der Domänenstruktur wird durch eine mikromagnetische Theorie für die Magnetisierungskurve eines einachsigen Einkristalls interpretiert. Die Bewegung der Domänenwände tritt erst ab einer Feldstärke von 265 Oe ein. Dies entspricht einer inneren Koerzitivfeldstärke, die durch das Peierlspotential und statistisch verteilte Gitterfehler hervorgerufen wird. Die Dichte der Wechselwirkungsenergie pro Ausdehnung der Wand wird für den Fall einer ebenen Wand als documentclass{article}pagestyle{empty}begin{document}$ E_0 sqrt {rho /L} = 30,erg/cm^4 $end{document} bestimmt. Die Nukleation der Domänen wird im Phasenübergang zwischen Ausscheidung und Matrix beobachtet. Des weiteren können Ausscheidungen in Korngrenzen als Nukleationszentren nachgewiesen werden. Diese Ergebnisse werden durch die Nukleation von Domänen in Bereichen niedriger Kristallanisotropie oder ungleichförmiger Ausscheidungsoberfläche interpretiert." @default.
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- W2010294214 title "Nucleation and pinning of magnetic domains at Co7Sm2 precipitates in Co5Sm crystals" @default.
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