Recently Hilzinger and Kronmuller have shown that the product of the coercive field and the initial permeability is independent of the concentration of the randomly distributed defects. Only a computer simulation experiment was carried out to check such dependence. I n this work experimental results are presented on Ni-5y0 Mn ailoys which confirm Hilzinger and Kronmiiller's predictions. The weak and strong interactions between the lattice defects and magnetic domain walls are considered. Kiinlich wurde von Hilzinger und Kronmuller gezeigt, daD das Produkt des Koerzitivfeldes und der Anfmgspermeabilitit unabhiingig von der Konzentration der statistisch verteilten Defekte ist. Jedoch wurde nur ein Computer-Simulationsexperiment zur Oberpriifung solcher Abhiingigkeit durchgefuhrt. I n dieser Arbeit werden experimentelle Ergebnisse an Ni-6% Mn-Legierungen mitgeteilt, die die Vorhersagen von Hilzinger und Kronmiiller bestiitigen. Die schwachen und starken Weohselwirkungen zwischen Gitterdefekten und magnetischen Domiinenwiinden werden beriicksichtigt.
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