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Spin-polarized localization in a magnetized chain
We investigate a simple tight-binding Hamiltonian to understand the stability of spin-polarized transport of states with an arbitrary spin content in the presence of disorder. The general spin state is made to pass through a linear chain of magnetic atoms, and the localization lengths are computed....
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6459837/ https://www.ncbi.nlm.nih.gov/pubmed/30976024 http://dx.doi.org/10.1038/s41598-019-42316-5 |
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author | Benini, Leonardo Mukherjee, Amrita Chakrabarti, Arunava Römer, Rudolf A. |
author_facet | Benini, Leonardo Mukherjee, Amrita Chakrabarti, Arunava Römer, Rudolf A. |
author_sort | Benini, Leonardo |
collection | PubMed |
description | We investigate a simple tight-binding Hamiltonian to understand the stability of spin-polarized transport of states with an arbitrary spin content in the presence of disorder. The general spin state is made to pass through a linear chain of magnetic atoms, and the localization lengths are computed. Depending on the value of spin, the chain of magnetic atoms unravels a hidden transverse dimensionality that can be exploited to engineer energy regimes where only a selected spin state is allowed to retain large localization lengths. We carry out a numerical anmalysis to understand the roles played by the spin projections in different energy regimes of the spectrum. For this purpose, we introduce a new measure, dubbed spin-resolved localization length. We study uncorrelated disorder in the potential profile offered by the magnetic substrate or in the orientations of the magnetic moments concerning a given direction in space. Our results show that the spin filtering effect is robust against weak disorder and hence the proposed system should be a good candidate model for experimental realizations of spin-selective transport devices. |
format | Online Article Text |
id | pubmed-6459837 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-64598372019-04-16 Spin-polarized localization in a magnetized chain Benini, Leonardo Mukherjee, Amrita Chakrabarti, Arunava Römer, Rudolf A. Sci Rep Article We investigate a simple tight-binding Hamiltonian to understand the stability of spin-polarized transport of states with an arbitrary spin content in the presence of disorder. The general spin state is made to pass through a linear chain of magnetic atoms, and the localization lengths are computed. Depending on the value of spin, the chain of magnetic atoms unravels a hidden transverse dimensionality that can be exploited to engineer energy regimes where only a selected spin state is allowed to retain large localization lengths. We carry out a numerical anmalysis to understand the roles played by the spin projections in different energy regimes of the spectrum. For this purpose, we introduce a new measure, dubbed spin-resolved localization length. We study uncorrelated disorder in the potential profile offered by the magnetic substrate or in the orientations of the magnetic moments concerning a given direction in space. Our results show that the spin filtering effect is robust against weak disorder and hence the proposed system should be a good candidate model for experimental realizations of spin-selective transport devices. Nature Publishing Group UK 2019-04-11 /pmc/articles/PMC6459837/ /pubmed/30976024 http://dx.doi.org/10.1038/s41598-019-42316-5 Text en © The Author(s) 2019 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Benini, Leonardo Mukherjee, Amrita Chakrabarti, Arunava Römer, Rudolf A. Spin-polarized localization in a magnetized chain |
title | Spin-polarized localization in a magnetized chain |
title_full | Spin-polarized localization in a magnetized chain |
title_fullStr | Spin-polarized localization in a magnetized chain |
title_full_unstemmed | Spin-polarized localization in a magnetized chain |
title_short | Spin-polarized localization in a magnetized chain |
title_sort | spin-polarized localization in a magnetized chain |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6459837/ https://www.ncbi.nlm.nih.gov/pubmed/30976024 http://dx.doi.org/10.1038/s41598-019-42316-5 |
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