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Strain driven phase transition and mechanism for Fe/Ir(111) films

By way of introducing heterogeneous interfaces, the stabilization of crystallographic phases is critical to a viable strategy for developing materials with novel characteristics, such as occurrence of new structure phase, anomalous enhancement in magnetic moment, enhancement of efficiency as nanopor...

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Autores principales: Hsieh, Chen-Yuan, Jiang, Pei-Cheng, Chen, Wei-Hsiang, Tsay, Jyh-Shen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8578644/
https://www.ncbi.nlm.nih.gov/pubmed/34754026
http://dx.doi.org/10.1038/s41598-021-01474-1
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author Hsieh, Chen-Yuan
Jiang, Pei-Cheng
Chen, Wei-Hsiang
Tsay, Jyh-Shen
author_facet Hsieh, Chen-Yuan
Jiang, Pei-Cheng
Chen, Wei-Hsiang
Tsay, Jyh-Shen
author_sort Hsieh, Chen-Yuan
collection PubMed
description By way of introducing heterogeneous interfaces, the stabilization of crystallographic phases is critical to a viable strategy for developing materials with novel characteristics, such as occurrence of new structure phase, anomalous enhancement in magnetic moment, enhancement of efficiency as nanoportals. Because of the different lattice structures at the interface, heterogeneous interfaces serve as a platform for controlling pseudomorphic growth, nanostructure evolution and formation of strained clusters. However, our knowledge related to the strain accumulation phenomenon in ultrathin Fe layers on face-centered cubic (fcc) substrates remains limited. For Fe deposited on Ir(111), here we found the existence of strain accumulation at the interface and demonstrate a strain driven phase transition in which fcc-Fe is transformed to a bcc phase. By substituting the bulk modulus and the shear modulus and the experimental results of lattice parameters in cubic geometry, we obtain the strain energy density for different Fe thicknesses. A limited distortion mechanism is proposed for correlating the increasing interfacial strain energy, the surface energy, and a critical thickness. The calculation shows that the strained layers undergo a phase transition to the bulk structure above the critical thickness. The results are well consistent with experimental measurements. The strain driven phase transition and mechanism presented herein provide a fundamental understanding of strain accumulation at the bcc/fcc interface.
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spelling pubmed-85786442021-11-10 Strain driven phase transition and mechanism for Fe/Ir(111) films Hsieh, Chen-Yuan Jiang, Pei-Cheng Chen, Wei-Hsiang Tsay, Jyh-Shen Sci Rep Article By way of introducing heterogeneous interfaces, the stabilization of crystallographic phases is critical to a viable strategy for developing materials with novel characteristics, such as occurrence of new structure phase, anomalous enhancement in magnetic moment, enhancement of efficiency as nanoportals. Because of the different lattice structures at the interface, heterogeneous interfaces serve as a platform for controlling pseudomorphic growth, nanostructure evolution and formation of strained clusters. However, our knowledge related to the strain accumulation phenomenon in ultrathin Fe layers on face-centered cubic (fcc) substrates remains limited. For Fe deposited on Ir(111), here we found the existence of strain accumulation at the interface and demonstrate a strain driven phase transition in which fcc-Fe is transformed to a bcc phase. By substituting the bulk modulus and the shear modulus and the experimental results of lattice parameters in cubic geometry, we obtain the strain energy density for different Fe thicknesses. A limited distortion mechanism is proposed for correlating the increasing interfacial strain energy, the surface energy, and a critical thickness. The calculation shows that the strained layers undergo a phase transition to the bulk structure above the critical thickness. The results are well consistent with experimental measurements. The strain driven phase transition and mechanism presented herein provide a fundamental understanding of strain accumulation at the bcc/fcc interface. Nature Publishing Group UK 2021-11-09 /pmc/articles/PMC8578644/ /pubmed/34754026 http://dx.doi.org/10.1038/s41598-021-01474-1 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Hsieh, Chen-Yuan
Jiang, Pei-Cheng
Chen, Wei-Hsiang
Tsay, Jyh-Shen
Strain driven phase transition and mechanism for Fe/Ir(111) films
title Strain driven phase transition and mechanism for Fe/Ir(111) films
title_full Strain driven phase transition and mechanism for Fe/Ir(111) films
title_fullStr Strain driven phase transition and mechanism for Fe/Ir(111) films
title_full_unstemmed Strain driven phase transition and mechanism for Fe/Ir(111) films
title_short Strain driven phase transition and mechanism for Fe/Ir(111) films
title_sort strain driven phase transition and mechanism for fe/ir(111) films
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8578644/
https://www.ncbi.nlm.nih.gov/pubmed/34754026
http://dx.doi.org/10.1038/s41598-021-01474-1
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