Atomic ordering reation and associated variation of magnetic coercivity of oriented L1₀-Fept nanoparticles

Sato, Kazuhisa; Bian, Bo; Hirotsu, Yoshihiko

Atomic ordering reation and associated variation of magnetic coercivity of oriented L1₀-Fept nanoparticles

Sato, Kazuhisa; Bian, Bo; Hirotsu, Yoshihiko

Journal of Ceramic Processing Research, 2000, 1(2), 109-114

アクセス数:254件（2025-08-14 17:50 集計）

固定URL: https://hdl.handle.net/11094/89452

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タイトル	Atomic ordering reation and associated variation of magnetic coercivity of oriented L1₀-Fept nanoparticles
著者	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 1000080283810 1000080283810 著者名 Bian, Bo
	NRID 1000070016525 1000070016525 著者名 Hirotsu, Yoshihiko
キーワード等	Atomic ordering
	L1₀-FePt
	Amorphous Al₂O₃
	HRTEM
	Hard magnetism
	High-density recording
	Thermal fluctuation
	Remanent magnetization decay
抄録	Atomically ordered FePt nanoparticles (L10-type structure) covered with amorphous (a-) Al2O3 have been fabricated. In this process, Fe particles were deposited on Pt “seed” particles which were epitaxially grown on (100) NaCl or MgO substrates. Annealing the a-Al2O3/Fe/Pt films at temperatures higher than 773 K leads to a formation of ordered nanoparticles with mutual fixed orientation in a monolayer form. Three variant ordered domains of the tetragonal L10 structure coexisted in a single nm-sized FePt particle, even in a particle as small as 7 nm. According to in-situ electron diffraction study, the degree of order of the ordered structure started to increase on annealing at 773 K and almost saturated on annealing at 873 K for 16 h. The magnetic coercivity varied depending on the particle size and the degree of order in the L10 structure formation. The perpendicular coercivity exceeded the in-plane one during the annealing. The in-plane coercivities of FePt nanoparticles measured both parallel to [100]MgO and [010]MgO directions were almost equal in numerical value. These results reflect the ordered domain formation process and the volume fraction of the domains. Remanent magnetization decay measured for the in-plane magnetization revealed a magnetic relaxation with the type of magnetic dipolar interaction between the FePt particles.
出版者	International Organization for Ceramic Processing
収録物名	Journal of Ceramic Processing Research
巻(号)	1(2)
ページ	109-114
刊行年月	2000-12-31
言語	英語
ハンドルURL	https://hdl.handle.net/11094/89452
PISSN	12299162
eISSN	2672152X
NCID	AA12173362
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

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
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Journal of Ceramic Processing Research. 2000, 1(2), p. 109-114
DC.title	Atomic ordering reation and associated variation of magnetic coercivity of oriented L1₀-Fept nanoparticles
DC.creator	Sato, Kazuhisa
	Bian, Bo
	Hirotsu, Yoshihiko
DC.publisher	International Organization for Ceramic Processing
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2000-12-31
DC.subject	Atomic ordering
	L1₀-FePt
	Amorphous Al₂O₃
	HRTEM
	Hard magnetism
	High-density recording
	Thermal fluctuation
	Remanent magnetization decay
DCTERMS.abstract	Atomically ordered FePt nanoparticles (L10-type structure) covered with amorphous (a-) Al2O3 have been fabricated. In this process, Fe particles were deposited on Pt “seed” particles which were epitaxially grown on (100) NaCl or MgO substrates. Annealing the a-Al2O3/Fe/Pt films at temperatures higher than 773 K leads to a formation of ordered nanoparticles with mutual fixed orientation in a monolayer form. Three variant ordered domains of the tetragonal L10 structure coexisted in a single nm-sized FePt particle, even in a particle as small as 7 nm. According to in-situ electron diffraction study, the degree of order of the ordered structure started to increase on annealing at 773 K and almost saturated on annealing at 873 K for 16 h. The magnetic coercivity varied depending on the particle size and the degree of order in the L10 structure formation. The perpendicular coercivity exceeded the in-plane one during the annealing. The in-plane coercivities of FePt nanoparticles measured both parallel to [100]MgO and [010]MgO directions were almost equal in numerical value. These results reflect the ordered domain formation process and the volume fraction of the domains. Remanent magnetization decay measured for the in-plane magnetization revealed a magnetic relaxation with the type of magnetic dipolar interaction between the FePt particles.
DC.rights	This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
DC.format	89452
citation_title	Atomic ordering reation and associated variation of magnetic coercivity of oriented L1₀-Fept nanoparticles
citation_author	Sato, Kazuhisa
	Bian, Bo
	Hirotsu, Yoshihiko
citation_publisher	International Organization for Ceramic Processing
citation_language	英語
citation_date	2000-12-31
citation_journal_title	Journal of Ceramic Processing Research
citation_volume	1
citation_issue	2
citation_firstpage	109
citation_lastpage	114
citation_public_url	https://hdl.handle.net/11094/89452

Atomic ordering reation and associated variation of magnetic coercivity of oriented L1₀-Fept nanoparticles

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