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Optical damage limit of efficient spintronic THz emitters
THz pulses are generated from femtosecond pulse-excited ferromagnetic/nonmagnetic spintronic heterostructures via inverse spin Hall effect. The highest possible THz signal strength from spintronic THz emitters is limited by the optical damage threshold of the corresponding heterostructures at the ex...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8496183/ https://www.ncbi.nlm.nih.gov/pubmed/34646990 http://dx.doi.org/10.1016/j.isci.2021.103152 |
_version_ | 1784579703583014912 |
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author | Kumar, Sandeep Nivedan, Anand Singh, Arvind Kumar, Yogesh Malhotra, Purnima Tondusson, Marc Freysz, Eric Kumar, Sunil |
author_facet | Kumar, Sandeep Nivedan, Anand Singh, Arvind Kumar, Yogesh Malhotra, Purnima Tondusson, Marc Freysz, Eric Kumar, Sunil |
author_sort | Kumar, Sandeep |
collection | PubMed |
description | THz pulses are generated from femtosecond pulse-excited ferromagnetic/nonmagnetic spintronic heterostructures via inverse spin Hall effect. The highest possible THz signal strength from spintronic THz emitters is limited by the optical damage threshold of the corresponding heterostructures at the excitation wavelength. For the thickness-optimized spintronic heterostructure, the THz generation efficiency does not saturate with the excitation fluence even up till the damage threshold. Bilayer (Fe, CoFeB)/(Pt, Ta)-based ferromagnetic/nonmagnetic (FM/NM) spintronic heterostructures have been studied for an optimized performance for THz generation when pumped by sub-50 fs amplified laser pulses at 800 nm. Among them, CoFeB/Pt is the best combination for an efficient THz source. The optimized FM/NM spintronic heterostructure having α-phase Ta as the nonmagnetic layer shows the highest damage threshold as compared to those with Pt, irrespective of their generation efficiency. The damage threshold of the Fe/Ta heterostructure on a quartz substrate is ∼85 GW/cm(2). |
format | Online Article Text |
id | pubmed-8496183 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-84961832021-10-12 Optical damage limit of efficient spintronic THz emitters Kumar, Sandeep Nivedan, Anand Singh, Arvind Kumar, Yogesh Malhotra, Purnima Tondusson, Marc Freysz, Eric Kumar, Sunil iScience Article THz pulses are generated from femtosecond pulse-excited ferromagnetic/nonmagnetic spintronic heterostructures via inverse spin Hall effect. The highest possible THz signal strength from spintronic THz emitters is limited by the optical damage threshold of the corresponding heterostructures at the excitation wavelength. For the thickness-optimized spintronic heterostructure, the THz generation efficiency does not saturate with the excitation fluence even up till the damage threshold. Bilayer (Fe, CoFeB)/(Pt, Ta)-based ferromagnetic/nonmagnetic (FM/NM) spintronic heterostructures have been studied for an optimized performance for THz generation when pumped by sub-50 fs amplified laser pulses at 800 nm. Among them, CoFeB/Pt is the best combination for an efficient THz source. The optimized FM/NM spintronic heterostructure having α-phase Ta as the nonmagnetic layer shows the highest damage threshold as compared to those with Pt, irrespective of their generation efficiency. The damage threshold of the Fe/Ta heterostructure on a quartz substrate is ∼85 GW/cm(2). Elsevier 2021-09-21 /pmc/articles/PMC8496183/ /pubmed/34646990 http://dx.doi.org/10.1016/j.isci.2021.103152 Text en © 2021 The Author(s) https://creativecommons.org/licenses/by/4.0/This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Kumar, Sandeep Nivedan, Anand Singh, Arvind Kumar, Yogesh Malhotra, Purnima Tondusson, Marc Freysz, Eric Kumar, Sunil Optical damage limit of efficient spintronic THz emitters |
title | Optical damage limit of efficient spintronic THz emitters |
title_full | Optical damage limit of efficient spintronic THz emitters |
title_fullStr | Optical damage limit of efficient spintronic THz emitters |
title_full_unstemmed | Optical damage limit of efficient spintronic THz emitters |
title_short | Optical damage limit of efficient spintronic THz emitters |
title_sort | optical damage limit of efficient spintronic thz emitters |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8496183/ https://www.ncbi.nlm.nih.gov/pubmed/34646990 http://dx.doi.org/10.1016/j.isci.2021.103152 |
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