Ordering of island-like FePt crystallites with orientations

Bian, Bo; Sato, Kazuhisa; Hirotsu, Yoshihiko; Makino, Akihiro

doi:https://doi.org/10.1063/1.125429

Ordering of island-like FePt crystallites with orientations

Bian, Bo; Sato, Kazuhisa; Hirotsu, Yoshihiko et al.

Applied Physics Letters, 1999, 75(23), 3686-3688

Number of Access:364（2025-08-16 00:37 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89389

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Title	Ordering of island-like FePt crystallites with orientations
Creator	NRID 1000080283810 1000080283810 CreatorName Bian, Bo
	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
	NRID 1000030315642 1000030315642 CreatorName Makino, Akihiro
Description	Bo Bian, Kazuhisa Sato, and Yoshihiko Hirotsu, "Ordering of island-like FePt crystallites with orientations", Appl. Phys. Lett. 75, 3686-3688 (1999) https://doi.org/10.1063/1.125429.
Abstract	Thin films of oriented island-like crystallites of L10 FePt separated by amorphous (a-) Al₂O₃ were fabricated. The process took advantage of the overgrowth of α-Fe on Pt "seed" particles epitaxially grown on (100) NaCl and MgO substrates and the ordering reaction between Fe and Pt upon annealing at temperatures higher than 500°C. The coercivities of the annealed (600°C for 6 h) a-Al₂O₃/Fe(1 nm)/Pt (1.5 nm) films on both the NaCl (100) and MgO (100) substrates are higher than 3.3 kOe. Transmission electron microscopy observation showed that the film consisted of oriented L10 FePt island-like crystals with an average size of 12 nm and a separation of 4 nm. It was found that any one of the three 〈100〉 axes of the fcc Pt parent particles could act as the tetragonal c axis of the L10 FePt superstructure and all three-variant ordered crystalline domains of the tetragonal L10 phase could exist in the small 10-nm-size FePt crystallites. The high magnetic coercivity of the film, with well-separated FePt particles, can be attributed to the ordering (L10) as well as the oriented nature of the FePt crystallites. © 1999 American Institute of Physics.
Publisher	American Institute of Physics
Source Title	Applied Physics Letters
Volume (Issue)	75(23)
Page	3686-3688
Date of Issued	1999-12-06
Language	English
Handle URL	https://hdl.handle.net/11094/89389
PISSN	00036951
NCID	AA00543431
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1063/1.125429
Access Rights	open access
CopyRight	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Bo Bian, Kazuhisa Sato, and Yoshihiko Hirotsu, "Ordering of island-like FePt crystallites with orientations", Appl. Phys. Lett. 75, 3686-3688 (1999) and may be found at https://doi.org/10.1063/1.125429.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Applied Physics Letters. 1999, 75(23), p. 3686-3688
DC.title	Ordering of island-like FePt crystallites with orientations
DC.creator	Bian, Bo
	Sato, Kazuhisa
	Hirotsu, Yoshihiko
	Makino, Akihiro
DC.publisher	American Institute of Physics
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	1999-12-06
DC.identifier	https://doi.org/10.1063/1.125429
DC.description	Bo Bian, Kazuhisa Sato, and Yoshihiko Hirotsu, "Ordering of island-like FePt crystallites with orientations", Appl. Phys. Lett. 75, 3686-3688 (1999) https://doi.org/10.1063/1.125429.
DCTERMS.abstract	Thin films of oriented island-like crystallites of L10 FePt separated by amorphous (a-) Al₂O₃ were fabricated. The process took advantage of the overgrowth of α-Fe on Pt "seed" particles epitaxially grown on (100) NaCl and MgO substrates and the ordering reaction between Fe and Pt upon annealing at temperatures higher than 500°C. The coercivities of the annealed (600°C for 6 h) a-Al₂O₃/Fe(1 nm)/Pt (1.5 nm) films on both the NaCl (100) and MgO (100) substrates are higher than 3.3 kOe. Transmission electron microscopy observation showed that the film consisted of oriented L10 FePt island-like crystals with an average size of 12 nm and a separation of 4 nm. It was found that any one of the three 〈100〉 axes of the fcc Pt parent particles could act as the tetragonal c axis of the L10 FePt superstructure and all three-variant ordered crystalline domains of the tetragonal L10 phase could exist in the small 10-nm-size FePt crystallites. The high magnetic coercivity of the film, with well-separated FePt particles, can be attributed to the ordering (L10) as well as the oriented nature of the FePt crystallites. © 1999 American Institute of Physics.
DC.rights	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Bo Bian, Kazuhisa Sato, and Yoshihiko Hirotsu, "Ordering of island-like FePt crystallites with orientations", Appl. Phys. Lett. 75, 3686-3688 (1999) and may be found at https://doi.org/10.1063/1.125429.
DC.format	89389
citation_title	Ordering of island-like FePt crystallites with orientations
citation_author	Bian, Bo
	Sato, Kazuhisa
	Hirotsu, Yoshihiko
	Makino, Akihiro
citation_publisher	American Institute of Physics
citation_language	English
citation_date	1999-12-06
citation_journal_title	Applied Physics Letters
citation_volume	75
citation_issue	23
citation_firstpage	3686
citation_lastpage	3688
citation_doi	https://doi.org/10.1063/1.125429
citation_public_url	https://hdl.handle.net/11094/89389

Ordering of island-like FePt crystallites with orientations

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