Characterization of superpararnagnetic "core-shell" nanoparticles and monitoring their anisotropic phase transition to ferromagnetic "solid solution" nanoalloyse
SCIE
SCOPUS
- Title
- Characterization of superpararnagnetic "core-shell" nanoparticles and monitoring their anisotropic phase transition to ferromagnetic "solid solution" nanoalloyse
- Authors
- Park, JI; Kim, MG; Jun, YW; Lee, JS; Lee, WR; Cheon, J
- Date Issued
- 2004-07-28
- Publisher
- AMER CHEMICAL SOC
- Abstract
- The structure, magnetism, and phase transition of core-shell type CoPt nanoparticles en route to solid solution alloy nanostructures are systematically investigated. The characterization of CocorePtshell nanoparticles obtained by a "redox transmetalation" process by transmission electron microscopy (TEM) and, in particular, X-ray absorption spectroscopy (XAS) provides clear evidence for the existence of a core-shell type bimetallic interfacial structure. Nanoscale phase transitions of the CocorePtshell structures toward c-axis compressed face-centered tetragonal (fct) solid solution alloy CoPt nanoparticles are monitored at various stages of a thermally induced annealing process and the obtained fct nanoalloys show a large enhancement of their magnetic properties with ferromagnetism. The relationship between the nanostructures and their magnetic properties is in part elucidated through the use of XAS as a critical analytical tool.
- Keywords
- ABSORPTION FINE-STRUCTURE; BIMETALLIC CLUSTERS; STRUCTURAL-ANALYSIS; NANOCRYSTAL SUPERLATTICES; MAGNETIC NANOPARTICLES; STRUCTURE SPECTROSCOPY; CATALYSTS; EXAFS; PRECURSORS; CORE/SHELL
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/17794
- DOI
- 10.1021/JA049649K
- ISSN
- 0002-7863
- Article Type
- Article
- Citation
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 126, no. 29, page. 9072 - 9078, 2004-07-28
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