NDLI: Structure and magnetic properties of nano-structured heterogeneous Au

Content Provider	Springer Nature Link
Author	Zeu, V. Y. Kusinski, G. Yue, L. Thomas, G.
Copyright Year	2003
Abstract	High-resolution and analytical transmission electron microscopy, X-ray diffraction, magnetic and magnetoresistance measurements were used to investigate nanostructures of melt-spun Au$_{86}$Co$_{14}$ and Au$_{78}$Co$_{22}$ alloys. The microstructure of the Au$_{86}$Co$_{14}$ alloy was composed of very small Co precipitates inside the Au grains with some larger Co precipitates (20–35 nm) dispersed at the grain boundaries, while the microstructure of the Au$_{78}$Co$_{22}$ alloy consisted of Au/Co lamellar eutectic grains with Co precipitates (50–70 nm) dispersed at the grain boundaries. A few grains had very small (4 nm) Co precipitates. Annealing at 773 K for 10 min caused Co depletion in the Au matrix from 5.4–10 at.% to 0.9–2.0 at.%. Annealing also caused transitions from superparamagnetic to ferromagnetic and from single to multiple domain magnetic structure of some of the small and some of the larger Co precipitates, respectively. The MR ratios (Δρ/ρ, in magnetic field of 14.5 kOe) of the as-cast Au$_{86}$Co$_{14}$ and Au$_{78}$Co$_{22}$ alloys were 2.5% and 2.6%, respectively. Annealing of the alloys at 673 K for 1 hr reduced Δρ/ρ to 0.9–1%.
Starting Page	2679
Ending Page	2688
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	38
Issue Number	12
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation Materials Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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