Surface-induced magnetism in Au particles/clusters

Magnetic properties of Au particles/clusters with different sizes and different shapes were investigated. It is found that magnetic behaviors of Au particles/clusters are strongly influenced by their morphology. The 25nm Au particles annealed at 700°C for 5h show a big change in shape with a much gr...

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Bibliographic Details
Published in:Materials letters 2012-11, Vol.87, p.169-171
Main Authors: Raghavender, A.T., Hong, Nguyen Hoa, Swain, Bhabani S., Jung, M-H., Lee, K-J., Lee, D-S.
Format: Article
Language:English
Subjects:
annealing
gold
Gold particles/clusters
magnetic properties
magnetism
Surface magnetism
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Summary:Magnetic properties of Au particles/clusters with different sizes and different shapes were investigated. It is found that magnetic behaviors of Au particles/clusters are strongly influenced by their morphology. The 25nm Au particles annealed at 700°C for 5h show a big change in shape with a much greater surface than that of 5nm Au particles, or 25nm particles without annealing, and as a result, magnetism was induced. It suggests that surface effect can play a key role in tailoring magnetic properties of Au particles/clusters. ► Surface dependence of magnetic behaviors of nanometer-sized-Au particles deposited by using an ion beam coater was investigated. ► Size and morphology of particles/clusters can influence strongly magnetic properties of gold (Au). ► Once a great surface can be formed, surface-magnetism can be induced. ► There is no limit for particles to be as small as 4–10nm to be magnetic.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2012.07.084