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

doi:https://doi.org/10.2320/matertrans.48.903

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

アクセス数:149件（2025-07-03 18:31 集計）

固定URL: https://hdl.handle.net/11094/97379

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タイトル	Low-temperature atomic ordering of oriented L1₀-FePtCu nanoparticles with high areal-density characterized by transmission electron microscopy and electron diffraction
著者	著者名 Ryu, Han Wool
	NRID 1000070314424 1000070314424 ORCID 0000-0001-9078-2541 0000-0001-9078-2541 researchmap permalink read0158304 read0158304 Scopus Author ID 55552977400 55552977400 著者名 Sato, Kazuhisa
	NRID 1000070016525 1000070016525 researchmap permalink read0185227 read0185227 著者名 Hirotsu, Yoshihiko
キーワード等	FePtCu
	L10 structure
	Low temperature ordering
	Nanoparticles
	Sputtering
	Transmission electron microscopy
内容	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.
抄録	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.
出版者	Japan Institute of Metals and Materials
収録物名	Materials Transactions
巻(号)	48(5)
ページ	903-908
刊行年月	2007-05-01
言語	英語
ハンドルURL	https://hdl.handle.net/11094/97379
PISSN	13459678
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.2320/matertrans.48.903
アクセス権	open access
出版タイプ	Version of Record
カテゴリ	会議発表論文 Conference Paper

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCTERMS.bibliographicCitation	Materials Transactions. 2007, 48(5), p. 903-908
DC.title	Low-temperature atomic ordering of oriented L1₀-FePtCu nanoparticles with high areal-density characterized by transmission electron microscopy and electron diffraction
DC.creator	Ryu, Han Wool
	Sato, Kazuhisa
	Hirotsu, Yoshihiko
DC.publisher	Japan Institute of Metals and Materials
DC.language' scheme='DCTERMS.RFC1766	英語
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2007-05-01
DC.identifier	https://doi.org/10.2320/matertrans.48.903
DC.subject	FePtCu
	L10 structure
	Low temperature ordering
	Nanoparticles
	Sputtering
	Transmission electron microscopy
DC.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.
DCTERMS.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.
DC.format	97379
citation_title	Low-temperature atomic ordering of oriented L1₀-FePtCu nanoparticles with high areal-density characterized by transmission electron microscopy and electron diffraction
citation_author	Ryu, Han Wool
	Sato, Kazuhisa
	Hirotsu, Yoshihiko
citation_publisher	Japan Institute of Metals and Materials
citation_language	英語
citation_date	2007-05-01
citation_journal_title	Materials Transactions
citation_volume	48
citation_issue	5
citation_firstpage	903
citation_lastpage	908
citation_doi	https://doi.org/10.2320/matertrans.48.903
citation_public_url	https://hdl.handle.net/11094/97379

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

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