Fabrication and morphologies of large directly ordered L1{sub 0} FePt nanoparticles in gas phase
- Center for Micromagnetics and Information Technologies (MINT) and Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455 (United States)
Gas phase synthesis of large directly ordered L1{sub 0} FePt nanoparticles was studied. Simultaneous control of the chemical ordering and the size of the FePt nanoparticle was successfully achieved. It was found that the chemical ordering of the FePt nanoparticles was mainly influenced by the energy conditions (thermal environments at nucleation and growth regions), which could be adjusted by varying the process parameters including the sputtering current density, the Ar gas pressure, etc. The sizes of ordered FePt nanoparticles were more related to the Fe and Pt atoms' density at the initial stage (close to target surface). Multiply twinned structures were observed in L1{sub 0} FePt nanoparticles with 12 and 17 nm mean sizes, but were absent in L1{sub 0} FePt nanoparticles with 6 nm mean size, which caused the relatively low coercivity of large L1{sub 0} FePt nanoparticles.
- OSTI ID:
- 21190136
- Journal Information:
- Journal of Applied Physics, Vol. 105, Issue 7; Conference: 53. annual conference on magnetism and magnetic materials, Austin, TX (United States), 10-14 Nov 2008; Other Information: DOI: 10.1063/1.3067847; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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