Trigonal Fe₂Si Nanosheets at Fe/Amorphous SiOx Interfaces for Spintronic Nanodevices 　

Sato, Kazuhisa; Fujii, Yuta

ACS Applied Nano Materials, 2024, 7(14), 16799-16805

Number of Access:427（2025-08-13 22:22 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/97367

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Title
Trigonal Fe₂Si Nanosheets at Fe/Amorphous SiOx Interfaces for Spintronic Nanodevices 　
Creator
NRID
1000070314424 1000070314424
ORCID
0000-0001-9078-2541 0000-0001-9078-2541
researchmap permalink
read0158304 read0158304
Scopus Author ID
55552977400 55552977400
CreatorName
Sato, Kazuhisa
CreatorName
Fujii, Yuta
Subject
Auger decay
electronic excitation
Fe2Si
nanosheets
nonradiative transition
Description
Sato K., Fujii Y.. Trigonal Fe₂Si Nanosheets at Fe/Amorphous SiOx Interfaces for Spintronic Nanodevices. ACS Applied Nano Materials 7, (2024); https://doi.org/10.1021/acsanm.4c02874.
Abstract
Trigonal Fe₂Si nanosheets, which are promising candidates for spintronic nanodevices, were synthesized at the Fe/amorphous (a-)SiOx thin film interface using electron irradiation. The formation of nanoscale silicide was confirmed at 90 K as well as at 298 K. Such a low-temperature synthesis of Fe₂Si can be attributed to the dissociation of a-SiOx induced by electronic excitation; Si-O bonds dissociate through Auger decay of core-holes generated by electronic excitation, and then, dissociated Si atoms form Fe-Si bonds. The amount of Fe₂Si formed at room temperature was greater than that at 90 K, suggesting that the atomic migration induced by electronic excitation involves a contribution of thermal energy. The amount of Fe₂Si nanosheets produced indicates that the Si-O bonds are more easily dissociated by electronic excitation in a-SiOx rather than in a-SiO₂. Formation of the Fe₂Si nanosheets found in this study differs from the formation of an equiatomic FeSi phase predicted by thermodynamic models assuming diffusion at a planar Fe/Si interface. We propose a versatile route to selectively form metal silicide nanosheets in an electron irradiated area at temperatures below room temperature.
Publisher
American Chemical Society
Source Title
ACS Applied Nano Materials
Volume (Issue)
7(14)
Page
16799-16805
Date of Issued
2024-07-13
Language
English
Handle URL
https://hdl.handle.net/11094/97367
eISSN
25740970
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1021/acsanm.4c02874
Access Rights
open access
CopyRight
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.4c02874.
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article