Structural evolution and magnetic properties of nano-granular metallic alloys

Fe clusters have been dispersed in Ag matrices using cluster beam (CB) sources without any heat treatment. Their structure and morphology have been studied by comparison with those of the sputter-deposited FeAg alloys using small angle X-ray scattering, high resolution transmission electron microsc...

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Published inJournal of non-crystalline solids Vol. 192-193; pp. 539 - 545
Main Authors Sumiyama, K, Suzuki, K, Makhlouf, S.A, Wakoh, K, Kamiyama, T, Yamamuro, S, Konno, T.J, Xu, Y.F, Sakurai, M, Hihara, T
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.1995
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Summary:Fe clusters have been dispersed in Ag matrices using cluster beam (CB) sources without any heat treatment. Their structure and morphology have been studied by comparison with those of the sputter-deposited FeAg alloys using small angle X-ray scattering, high resolution transmission electron microscopy and extended X-ray absorption fine structure measurements. In the granular alloys made by CB, bcc Fe clusters of a few nanometers dimension are detected, together with ten-nanometer scale geometrical and chemical fluctuations. In the sputter-deposited alloys, the Fe atoms are rather well mixed with the Ag atoms in the as-deposited state, and fcc Fe clusters are first formed and transform to larger bcc particles with increasing annealing temperature. The field-dependence of the magnetoresistance is well correlated with the growth mode of the Fe clusters in the granular alloys.
ISSN:0022-3093
1873-4812
DOI:10.1016/0022-3093(95)00403-3