Role of Ag addition inL10ordering of FePt-based nanocomposite magnets
| Autor: | A.D. Crisan, F. Vasiliu, O. Crisan, I. Mercioniu |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Philosophical Magazine. 94:174-189 |
| ISSN: | 1478-6443 1478-6435 |
| Popis: | The FePt system has important perspectives as high-temperature corrosion-resistant magnets. In the form of rapidly solidified melt-spun ribbons, FePt-based magnets may exhibit in certain cases a two-phase hard–soft magnetic behaviour. The present paper deals with a microstructural and magnetic study of FePtAgB alloys with increasing Ag content. The aim is to identify and confirm the effect of Ag addition in decreasing the temperature of the FePt disorder–order structural phase transformation. A detailed high-resolution transmission electron microscopy study is employed, and the alternative disposal of hard and soft regions within the two-phase microstructure is observed and interpreted with respect to the X-ray diffraction results. In the as-cast Ag-containing samples, it is shown that there is an optimum of the Ag content for which best magnetic properties are obtained. Ag addition creates a nonlinear behaviour of the coercive field and the ordering parameter, similar to the RKKY interaction-induced inte... |
| Databáze: | OpenAIRE |
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