Magnetic Analysis of a Ferromagnetic Cluster System in Partially Ordered Ni3Mn Alloy
| Autor: | Yuzi Kondo, Teiko Okazaki |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Materials Transactions, JIM. 39:231-236 |
| ISSN: | 2432-471X 0916-1821 |
| DOI: | 10.2320/matertrans1989.39.231 |
| Popis: | The magnetization vs. temperature curves for Ni 3 Mn alloys with long range order parameters, S=0.13 and 0.29 have an inflection point near Curie point T F . The curves show a ferromagnetic-phase profile in lower temperature and a long tail as a glass-like phase in wide temperature range above T F . We analyzed the magnetization in the glass-like phase by using of a superferromagnetic model in which a random set of ferromagnetic clusters with intra- and inter-cluster ferromagnetic couplings is taken into account. The method which has been used for magnetic analysis of rapidly quenched La-Fe alloys by Siratori et al. is found to be adequate to analyze the magnetization in the glass-like phase for a partially ordered Ni 3 Mn alloy. From these results, it is found that the magnetization in the glass-like phase depends on the average size of the ferromagnetic clusters distributed in nonmagnetic matrix. The cluster for the long range ordered Ni 3 Mn contains 140-2200 atoms (1.4 3 -2.9 3 nm 3 ) and the volume fraction of ordered regions is 0.11-0.32, which increases with S. |
| Databáze: | OpenAIRE |
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