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- W2056540898 abstract "It is well known that Fe-Al alloys show remarkable magnetic properties in a small range of composition near Fe70Al30. A number of different techniques have suggested that a progression from paramagnetism to ferromagnetism to superparamagnetism to mictomagnetism occurs as the temperature is lowered. We report here the influence on this progression of transition metal substitution for Al using low- and moderate-field magnetization measurements as well as neutron diffraction and SANS techniques to study polycrystalline samples quenched from 830 °C. The systems investigated may be written as Fe70Al30−x Tx, where T=Cr, Mn, or Co and x=1, 3, or 10. The neutron diffraction data showed that all the alloys crystallized in the doubly ordered L21 structure. For the alloys with x=1 the intrinsic magnetization deduced from measurements in moderate fields has a maximum near the temperature at which the reentrant transition to superparamagnetism is suspected together with an up-turn at a lower temperature. These features do not occur for the alloys having x=3 or 10. Low-field (∼5 Oe) measurements indicate, however, that a freezing temperature can be associated with alloys having x<4. A Q-dependent peak in the SANS data occurs near the ferro- to superpara-magnetic transition temperature suggesting an interpretation in terms of the freezing of clusters of different sizes. The results are interpreted to suggest that the main parameter determining the overall magnetic properties is the Al concentration." @default.
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- W2056540898 date "1987-04-15" @default.
- W2056540898 modified "2023-10-17" @default.
- W2056540898 title "Magnetic studies of Fe70Al30 alloys containing transition metal substitutions for Al" @default.
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- W2056540898 doi "https://doi.org/10.1063/1.338557" @default.
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