Please use this identifier to cite or link to this item: https://doi.org/43/435604
Title: Microstructure and direct ordering of FePt nanoparticles produced by nanocluster beam technology
Authors: Chen, J.S. 
Tan, C.Y.
Chow, G.M. 
Issue Date: 31-Oct-2007
Source: Chen, J.S.,Tan, C.Y.,Chow, G.M. (2007-10-31). Microstructure and direct ordering of FePt nanoparticles produced by nanocluster beam technology. Nanotechnology 18 (43) : -. ScholarBank@NUS Repository. https://doi.org/43/435604
Abstract: The equiaxed or polyhedral morphology of FePt nanoparticles can be produced by tuning the temperature of the nanoparticle-forming chamber. Weak beam dark-field (WBDF) and high resolution transmission electron microscopy (HRTEM) techniques were used to analyze the microstructures and three-dimensional (3D) shapes of the particles. The equiaxed nanoparticles formed at 170 K were icosahedra. The nanoparticles with the square shapes in bright-field TEM image were octahedra. The nanoparticles with hexagonal shapes were either truncated octahedral or icosahedral particles. The rhombic shapes in TEM images originated from both truncated octahedral and decahedral particles. As-deposited FePt nanoparticles showed superparamagnetic behavior. The FePt nanoparticles were partially chemically ordered and showed ferromagnetic behavior by annealing the nanoparticles in transit through the furnace from the source to the substrate. The coercivity of the polyhedral FePt particle assembly was about 600 Oe, whereas that of the equiaxed FePt particles was 450 Oe. The larger coercivity was attributed to the increased particle size for particles formed at the lower temperature of the nanoparticle-forming chamber, and better long-range order for the particles that went through the on-line heating chamber. © IOP Publishing Ltd.
Source Title: Nanotechnology
URI: http://scholarbank.nus.edu.sg/handle/10635/64947
ISSN: 09574484
DOI: 43/435604
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

25
checked on Dec 15, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.