期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 131, 期 43, 页码 15794-15801出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja906103p
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资金
- National Science Council of the Republic of China, Taiwan [NSC 97-2113-M-012-MY3, NSC 97-2112-M-003-007-MY3]
- Ministry of Economic Affairs of the Republic of China [97-EC-17-A-08-S1-006, 97-EC-17-A-01-S1026]
This investigation demonstrates the magnetic properties and nanostructures of CoPt3 wire arrays that were fabricated by electrodeposition using a porous alumina template. The X-ray absorption analysis clearly verified the occurrence of a phase transition in CoPt3 nanowires. This phase transition significantly influences the magnetic properties and enhances coercivity and squareness. The phase transition of CoPt3 nanowires was from a random alloy distribution to anisotropically ordered CoPt3 (L1(2)). The thermally induced phase transition of CoPt3 nanowires to ordered L1(2) CoPt3 through a cluster-in-cluster' intermediate state via interdiffusion processes is revealed. The mechanism exhibited by these CoPt3 nanowires is proposed to explain the strong correlation between their magnetic character and their atomic distribution.
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