Long-Range Order Parameter of Oriented L1₀-FePt Nanoparticles Determined by Electron Diffraction

Sato, Kazuhisa; Hirotsu, Yoshihiko

Materials Transactions, 2003, 44(8), 1518-1522

Number of Access:271（2025-08-14 05:02 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89446

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Title
Long-Range Order Parameter of Oriented L1₀-FePt Nanoparticles Determined by Electron Diffraction
Creator
NRID
1000070314424 1000070314424
ORCID
0000-0001-9078-2541 0000-0001-9078-2541
researchmap permalink
read0158304 read0158304
Scopus Author ID
55552977400 55552977400
CreatorName
Sato, Kazuhisa
NRID
1000070016525 1000070016525
CreatorName
Hirotsu, Yoshihiko
Subject
Dynamical scattering
Electron diffraction
FePt
Hh0 systematic reflection
Multi-slice simulation
Nanoparticle
Order parameter
Abstract
Two-dimensionally dispersed L10-FePt nanoparticles as small as 12 nm with orientation was fabricated by electron-beam evaporation and post-annealing at 873 K. After a prolonged annealing at 873 K for 86.4 ks, the increase of coercivity was almost saturated and coercivity reached 434 kAm -1 at 300 K, which is very small compared to recent reports on FePt nanoparticles with sizes larger than 20 nm. Long-range order parameter of the fabricated nanoparticles was determined by electron diffraction at 200 kV taking the multiple scattering into consideration. Obtained order parameter remained 0.55 ± 0.02 for the nanoparticles with an axial ratio c/a of 0.961 ± 0.003. The low degree of order is thought to be responsible for the small coercivity. Effect of Debye-Waller factor on the order parameter was discussed.
Publisher
The Japan Institute of Metals and Materials
Source Title
Materials Transactions
Volume (Issue)
44(8)
Page
1518-1522
Date of Issued
2003
Language
English
Handle URL
https://hdl.handle.net/11094/89446
PISSN
13459678
eISSN
13475320
NCID
AA1151294X
AA12041816
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.2320/matertrans.44.1518
Access Rights
open access
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article