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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...

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Autores principales: Kumar, Sandeep, Nivedan, Anand, Singh, Arvind, Kumar, Yogesh, Malhotra, Purnima, Tondusson, Marc, Freysz, Eric, Kumar, Sunil
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2021
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
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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).
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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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