Low-temperature atomic ordering of oriented L1₀-FePtCu nanoparticles with high areal-density characterized by transmission electron microscopy and electron diffraction

Ryu, Han Wool; Sato, Kazuhisa; Hirotsu, Yoshihiko

Materials Transactions, 2007, 48(5), 903-908

Number of Access:194（2025-08-14 12:13 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/97379

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Title
Low-temperature atomic ordering of oriented L1₀-FePtCu nanoparticles with high areal-density characterized by transmission electron microscopy and electron diffraction
Creator
CreatorName
Ryu, Han Wool
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
researchmap permalink
read0185227 read0185227
CreatorName
Hirotsu, Yoshihiko
Subject
FePtCu
L10 structure
Low temperature ordering
Nanoparticles
Sputtering
Transmission electron microscopy
Description
Ryu H.W., Sato K., Hirotsu Y.. Low-temperature atomic ordering of oriented L1₀-FePtCu nanoparticles with high areal-density characterized by transmission electron microscopy and electron diffraction. Materials Transactions 48, 903 (2007); https://doi.org/10.2320/matertrans.48.903.
Abstract
Oriented and densely dispersed Ll₀-FePtCu nanoparticles have been directly synthesized by co-evaporation of Fe, Pt and Cu using rfmagnetron sputtering onto NaCl substrate kept at 563-613 K without any post-deposition annealing. Formation of the L1₀-type structure in the specimens fabricated as low a substrate temperature as 563 K (Fe₄₀Pt ₅₀Cu₁₀) was confirmed by electron microscopy and electron diffraction, while the coercivity measured at room temperature was very low and the intensity of the superlattice reflections was quite weak. The atomic ordering was promoted in the specimen fabricated at 613 K with a composition of Fe₃₇Pt₅₂Cu₁₁, resulted in a higher coercivity exceeding 1 kOe at room temperature as well as appearance of clear superlattice reflections. In addition to the evolution of atomic ordering, (100) oriented growth was enhanced as the substrate temperature increased. Particle size dependence of long-range order (LRO) is considered to be responsible for the decrease of coercivity with particle size reduction as well as thermal fluctuation of magnetization. High coercivity was obtained for specimens with Cu concentration near 10at% under the present sputtering condition. The LRO in the FePtCu ternary phase is considered to sensitively depend on me alloy concentration.
Publisher
Japan Institute of Metals and Materials
Source Title
Materials Transactions
Volume (Issue)
48(5)
Page
903-908
Date of Issued
2007-05-01
Language
English
Handle URL
https://hdl.handle.net/11094/97379
PISSN
13459678
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.2320/matertrans.48.903
Access Rights
open access
oaire:version
Version of Record
Category
会議発表論文 Conference Paper