Structure optimization of FePt nanoparticles of various sizes for magnetic data storage.

Journal Article · Sun Apr 01 04:00:00 EDT 2007 · Metallurgical and Mater. Trans.

DOI:https://doi.org/10.1007/s11661-006-9081-6· OSTI ID:914908

Tanase, M; Zhu, J -G; Liu, C; Shukla, N; Klemmer, T J; Weller, D; Laughlin, D E

Surfactant-coated, fcc disordered FePt nanoparticles of three different sizes between 3 and 7 nm were prepared and washed according to a modified reaction route based on Sun et al. Hexane dispersions of nanoparticles were dried on transmission electron microscopy (TEM) grids, and the resulting monolayers were annealed by a sinter-free procedure at 600 C and at 650 C for 2 hours, respectively, developing the L1{sub 0} phase while preserving their monodispersity. The order parameter of the L1{sub 0} phase was measured using electron diffraction from statistically large ensembles of nanoparticles using an X-ray-like signal collection technique. The order parameter increases with particle size and with the temperature in the range 600 C to 650 C, being close to unity for the 7.2-nm particles annealed at 650 C for 2 hours.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; Carnegie Mellon Univ.; Seagate Research
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 914908
• Report Number(s): ANL/MSD/JA-58281
• Journal Information: Metallurgical and Mater. Trans., Journal Name: Metallurgical and Mater. Trans. Journal Issue: 4 ; Apr. 2007 Vol. 38A; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ELECTRON DIFFRACTION
IRON ALLOYS
MAGNETIC STORAGE DEVICES
NANOSTRUCTURES
ORDER PARAMETERS
PLATINUM ALLOYS