Order-Disorder Transitions Confined at the Interface of Pd@Co Core-Shell Nanoparticles: Implications for Magnetic Recording

Sato, Kazuhisa; Yasuda, Hidehiro

doi:https://doi.org/10.1021/acsanm.9b02371

Order-Disorder Transitions Confined at the Interface of Pd@Co Core-Shell Nanoparticles: Implications for Magnetic Recording

Sato, Kazuhisa; Yasuda, Hidehiro

ACS Applied Nano Materials, 2020, 3(2), 1592-1599

アクセス数:268件（2025-07-12 23:08 集計）

固定URL: https://hdl.handle.net/11094/97373

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タイトル	Order-Disorder Transitions Confined at the Interface of Pd@Co Core-Shell Nanoparticles: Implications for Magnetic Recording
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
著者	NRID 1000060210259 1000060210259 著者名 Yasuda, Hidehiro
キーワード等	core-shell structure
	HAADF-STEM
	nanoparticle
	order-disorder transition
	short-range order
内容	Sato K., Yasuda H.. Order-Disorder Transitions Confined at the Interface of Pd@Co Core-Shell Nanoparticles: Implications for Magnetic Recording. ACS Applied Nano Materials 3, 1592 (2020); https://doi.org/10.1021/acsanm.9b02371.
抄録	We observed an order-disorder transition confined to the interface of Pd@Co core-shell nanoparticles with a Pd core and Co shell. A local ordered region with the L1₀- and L1₂-type ordered structure 2-3 nm in size was formed in a ∼12 nm-sized particle. The local atomic order was only achieved in the narrow temperature range of 573-723 K, where the diffusion length is limited to a short-range comparable to the nearest-neighbor distance of the Co-Pd solid solution. Once the atom migration was activated (T ≥ 773 K), alloying of Co and Pd proceeded rapidly, and the ordered phase disappeared along with the core-shell structure. Namely, the stability of the ordered phase was diffusion controlled. Chemically sensitive atomic-resolution electron microscopy enabled detection of the local atomic order formed in a nanoparticle. Such local atomic order has the potential to enable tuning of the magnetic anisotropy of bimetallic nanomagnets, which may open a new route to realize ultrahigh-density magnetic storage media.
出版者	American Chemical Societyservice
収録物名	ACS Applied Nano Materials
巻(号)	3(2)
ページ	1592-1599
刊行年月	2020-01-16
言語	英語
ハンドルURL	https://hdl.handle.net/11094/97373
eISSN	25740970
関連情報 (isVersionOf)	DOI (出版社版) https://doi.org/10.1021/acsanm.9b02371
アクセス権	open access
権利情報	This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Nano Materials, © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsanm.9b0237.
出版タイプ	Accepted Manuscript
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
DCTERMS.bibliographicCitation	ACS Applied Nano Materials. 2020, 3(2), p. 1592-1599
DC.title	Order-Disorder Transitions Confined at the Interface of Pd@Co Core-Shell Nanoparticles: Implications for Magnetic Recording
DC.creator	Sato, Kazuhisa
DC.creator	Yasuda, Hidehiro
DC.publisher	American Chemical Societyservice
DC.language' scheme='DCTERMS.RFC1766	英語
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2020-01-16
DC.identifier	https://doi.org/10.1021/acsanm.9b02371
DC.subject	core-shell structure
	HAADF-STEM
	nanoparticle
	order-disorder transition
	short-range order
DC.description	Sato K., Yasuda H.. Order-Disorder Transitions Confined at the Interface of Pd@Co Core-Shell Nanoparticles: Implications for Magnetic Recording. ACS Applied Nano Materials 3, 1592 (2020); https://doi.org/10.1021/acsanm.9b02371.
DCTERMS.abstract	We observed an order-disorder transition confined to the interface of Pd@Co core-shell nanoparticles with a Pd core and Co shell. A local ordered region with the L1₀- and L1₂-type ordered structure 2-3 nm in size was formed in a ∼12 nm-sized particle. The local atomic order was only achieved in the narrow temperature range of 573-723 K, where the diffusion length is limited to a short-range comparable to the nearest-neighbor distance of the Co-Pd solid solution. Once the atom migration was activated (T ≥ 773 K), alloying of Co and Pd proceeded rapidly, and the ordered phase disappeared along with the core-shell structure. Namely, the stability of the ordered phase was diffusion controlled. Chemically sensitive atomic-resolution electron microscopy enabled detection of the local atomic order formed in a nanoparticle. Such local atomic order has the potential to enable tuning of the magnetic anisotropy of bimetallic nanomagnets, which may open a new route to realize ultrahigh-density magnetic storage media.
DC.rights	This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Nano Materials, © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsanm.9b0237.
DC.format	97373
citation_title	Order-Disorder Transitions Confined at the Interface of Pd@Co Core-Shell Nanoparticles: Implications for Magnetic Recording
citation_author	Sato, Kazuhisa
citation_author	Yasuda, Hidehiro
citation_publisher	American Chemical Societyservice
citation_language	英語
citation_date	2020-01-16
citation_journal_title	ACS Applied Nano Materials
citation_volume	3
citation_issue	2
citation_firstpage	1592
citation_lastpage	1599
citation_doi	https://doi.org/10.1021/acsanm.9b02371
citation_public_url	https://hdl.handle.net/11094/97373

Order-Disorder Transitions Confined at the Interface of Pd@Co Core-Shell Nanoparticles: Implications for Magnetic Recording

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