High-temperature antiferromagnetism in molecular semiconductor thin films and nanostructures

The viability of dilute magnetic semiconductors in applications is linked to the strength of the magnetic couplings, and room temperature operation is still elusive in standard inorganic systems. Molecular semiconductors are emerging as an alternative due to their long spin-relaxation times and ease...

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Autores principales: Serri, Michele, Wu, Wei, Fleet, Luke R., Harrison, Nicholas M., Hirjibehedin, Cyrus F., Kay, Christopher W.M., Fisher, Andrew J., Aeppli, Gabriel, Heutz, Sandrine
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Pub. Group 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3941018/
https://www.ncbi.nlm.nih.gov/pubmed/24445992
http://dx.doi.org/10.1038/ncomms4079
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author Serri, Michele
Wu, Wei
Fleet, Luke R.
Harrison, Nicholas M.
Hirjibehedin, Cyrus F.
Kay, Christopher W.M.
Fisher, Andrew J.
Aeppli, Gabriel
Heutz, Sandrine
author_facet Serri, Michele
Wu, Wei
Fleet, Luke R.
Harrison, Nicholas M.
Hirjibehedin, Cyrus F.
Kay, Christopher W.M.
Fisher, Andrew J.
Aeppli, Gabriel
Heutz, Sandrine
author_sort Serri, Michele
collection PubMed
description The viability of dilute magnetic semiconductors in applications is linked to the strength of the magnetic couplings, and room temperature operation is still elusive in standard inorganic systems. Molecular semiconductors are emerging as an alternative due to their long spin-relaxation times and ease of processing, but, with the notable exception of vanadium-tetracyanoethylene, magnetic transition temperatures remain well below the boiling point of liquid nitrogen. Here we show that thin films and powders of the molecular semiconductor cobalt phthalocyanine exhibit strong antiferromagnetic coupling, with an exchange energy reaching 100 K. This interaction is up to two orders of magnitude larger than in related phthalocyanines and can be obtained on flexible plastic substrates, under conditions compatible with routine organic electronic device fabrication. Ab initio calculations show that coupling is achieved via superexchange between the singly occupied a(1g) ([Image: see text]) orbitals. By reaching the key milestone of magnetic coupling above 77 K, these results establish quantum spin chains as a potentially useable feature of molecular films.
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spelling pubmed-39410182014-03-04 High-temperature antiferromagnetism in molecular semiconductor thin films and nanostructures Serri, Michele Wu, Wei Fleet, Luke R. Harrison, Nicholas M. Hirjibehedin, Cyrus F. Kay, Christopher W.M. Fisher, Andrew J. Aeppli, Gabriel Heutz, Sandrine Nat Commun Article The viability of dilute magnetic semiconductors in applications is linked to the strength of the magnetic couplings, and room temperature operation is still elusive in standard inorganic systems. Molecular semiconductors are emerging as an alternative due to their long spin-relaxation times and ease of processing, but, with the notable exception of vanadium-tetracyanoethylene, magnetic transition temperatures remain well below the boiling point of liquid nitrogen. Here we show that thin films and powders of the molecular semiconductor cobalt phthalocyanine exhibit strong antiferromagnetic coupling, with an exchange energy reaching 100 K. This interaction is up to two orders of magnitude larger than in related phthalocyanines and can be obtained on flexible plastic substrates, under conditions compatible with routine organic electronic device fabrication. Ab initio calculations show that coupling is achieved via superexchange between the singly occupied a(1g) ([Image: see text]) orbitals. By reaching the key milestone of magnetic coupling above 77 K, these results establish quantum spin chains as a potentially useable feature of molecular films. Nature Pub. Group 2014-01-21 /pmc/articles/PMC3941018/ /pubmed/24445992 http://dx.doi.org/10.1038/ncomms4079 Text en Copyright © 2014, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/3.0/ This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. To view a copy of this licence visit http://creativecommons.org/licenses/by/3.0/.
spellingShingle Article
Serri, Michele
Wu, Wei
Fleet, Luke R.
Harrison, Nicholas M.
Hirjibehedin, Cyrus F.
Kay, Christopher W.M.
Fisher, Andrew J.
Aeppli, Gabriel
Heutz, Sandrine
High-temperature antiferromagnetism in molecular semiconductor thin films and nanostructures
title High-temperature antiferromagnetism in molecular semiconductor thin films and nanostructures
title_full High-temperature antiferromagnetism in molecular semiconductor thin films and nanostructures
title_fullStr High-temperature antiferromagnetism in molecular semiconductor thin films and nanostructures
title_full_unstemmed High-temperature antiferromagnetism in molecular semiconductor thin films and nanostructures
title_short High-temperature antiferromagnetism in molecular semiconductor thin films and nanostructures
title_sort high-temperature antiferromagnetism in molecular semiconductor thin films and nanostructures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3941018/
https://www.ncbi.nlm.nih.gov/pubmed/24445992
http://dx.doi.org/10.1038/ncomms4079
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