Intrinsic giant magnetoresistance due to exchange-bias-type effects at the surface of single-crystalline NiS2 nanoflakes

[EN]The coexistence of different properties in the same material often results in exciting physical effects. At low temperatures, the pyrite transition-metal disulphide NiS2 hosts both antiferromagnetic and weak ferromagnetic orders, along with surface metallicity dominating its electronic transport...

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Autores: Hartmann, Roman, Högen, Michael, Lignon, Daphné, Tan, Anthony K. C., Amado Montero, Mario, El-Khatib, Sami, Egilmez, Mehmet, Das, Bhaskar, Leighton, Chris, Atatüre, Mete, Scheer, Elke, Di Bernardo, Angelo
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Universidad de Salamanca (USAL)
Repositorio:GREDOS. Repositorio Institucional de la Universidad de Salamanca
OAI Identifier:oai:gredos.usal.es:10366/168805
Acceso en línea:http://hdl.handle.net/10366/168805
Access Level:acceso abierto
Palabra clave:Intrinsic giant magnetoresistance
Single-crystalline NiS2 nanoflakes
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spelling Intrinsic giant magnetoresistance due to exchange-bias-type effects at the surface of single-crystalline NiS2 nanoflakesHartmann, RomanHögen, MichaelLignon, DaphnéTan, Anthony K. C.Amado Montero, MarioEl-Khatib, SamiEgilmez, MehmetDas, BhaskarLeighton, ChrisAtatüre, MeteScheer, ElkeDi Bernardo, AngeloIntrinsic giant magnetoresistanceSingle-crystalline NiS2 nanoflakes[EN]The coexistence of different properties in the same material often results in exciting physical effects. At low temperatures, the pyrite transition-metal disulphide NiS2 hosts both antiferromagnetic and weak ferromagnetic orders, along with surface metallicity dominating its electronic transport. The interplay between such a complex magnetic structure and surface-dominated conduction in NiS2, however, is still not understood. A possible reason for this limited understanding is that NiS2 has been available primarily in bulk single-crystal form, which makes it difficult to perform studies combining magnetometry and transport measurements with high spatial resolution. Here, NiS2 nanoflakes are produced via mechanical cleaving and exfoliation of NiS2 single crystals and their properties are studied on a local (micron-size) scale. Strongly field-asymmetric magnetotransport features are found at low temperatures, which resemble those of more complex magnetic thin film heterostructures. Using nitrogen vacancy magnetometry, these magnetotransport features are related to exchange-bias-type effects between ferromagnetic and antiferromagnetic regions forming near step edges at the nanoflake surface. Nanoflakes with bigger steps exhibit giant magnetoresistance, which suggests a strong influence of magnetic spin textures at the NiS2 surface on its electronic transport. These findings pave the way for the application of NiS2 nanoflakes in van der Waals heterostructures for low-temperature spintronics and superconducting spintronics.The Royal Society of Chemistry202620262023info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10366/168805reponame:GREDOS. Repositorio Institucional de la Universidad de Salamancainstname:Universidad de Salamanca (USAL)InglésAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:gredos.usal.es:10366/1688052026-06-07T06:28:51Z
dc.title.none.fl_str_mv Intrinsic giant magnetoresistance due to exchange-bias-type effects at the surface of single-crystalline NiS2 nanoflakes
title Intrinsic giant magnetoresistance due to exchange-bias-type effects at the surface of single-crystalline NiS2 nanoflakes
spellingShingle Intrinsic giant magnetoresistance due to exchange-bias-type effects at the surface of single-crystalline NiS2 nanoflakes
Hartmann, Roman
Intrinsic giant magnetoresistance
Single-crystalline NiS2 nanoflakes
title_short Intrinsic giant magnetoresistance due to exchange-bias-type effects at the surface of single-crystalline NiS2 nanoflakes
title_full Intrinsic giant magnetoresistance due to exchange-bias-type effects at the surface of single-crystalline NiS2 nanoflakes
title_fullStr Intrinsic giant magnetoresistance due to exchange-bias-type effects at the surface of single-crystalline NiS2 nanoflakes
title_full_unstemmed Intrinsic giant magnetoresistance due to exchange-bias-type effects at the surface of single-crystalline NiS2 nanoflakes
title_sort Intrinsic giant magnetoresistance due to exchange-bias-type effects at the surface of single-crystalline NiS2 nanoflakes
dc.creator.none.fl_str_mv Hartmann, Roman
Högen, Michael
Lignon, Daphné
Tan, Anthony K. C.
Amado Montero, Mario
El-Khatib, Sami
Egilmez, Mehmet
Das, Bhaskar
Leighton, Chris
Atatüre, Mete
Scheer, Elke
Di Bernardo, Angelo
author Hartmann, Roman
author_facet Hartmann, Roman
Högen, Michael
Lignon, Daphné
Tan, Anthony K. C.
Amado Montero, Mario
El-Khatib, Sami
Egilmez, Mehmet
Das, Bhaskar
Leighton, Chris
Atatüre, Mete
Scheer, Elke
Di Bernardo, Angelo
author_role author
author2 Högen, Michael
Lignon, Daphné
Tan, Anthony K. C.
Amado Montero, Mario
El-Khatib, Sami
Egilmez, Mehmet
Das, Bhaskar
Leighton, Chris
Atatüre, Mete
Scheer, Elke
Di Bernardo, Angelo
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Intrinsic giant magnetoresistance
Single-crystalline NiS2 nanoflakes
topic Intrinsic giant magnetoresistance
Single-crystalline NiS2 nanoflakes
description [EN]The coexistence of different properties in the same material often results in exciting physical effects. At low temperatures, the pyrite transition-metal disulphide NiS2 hosts both antiferromagnetic and weak ferromagnetic orders, along with surface metallicity dominating its electronic transport. The interplay between such a complex magnetic structure and surface-dominated conduction in NiS2, however, is still not understood. A possible reason for this limited understanding is that NiS2 has been available primarily in bulk single-crystal form, which makes it difficult to perform studies combining magnetometry and transport measurements with high spatial resolution. Here, NiS2 nanoflakes are produced via mechanical cleaving and exfoliation of NiS2 single crystals and their properties are studied on a local (micron-size) scale. Strongly field-asymmetric magnetotransport features are found at low temperatures, which resemble those of more complex magnetic thin film heterostructures. Using nitrogen vacancy magnetometry, these magnetotransport features are related to exchange-bias-type effects between ferromagnetic and antiferromagnetic regions forming near step edges at the nanoflake surface. Nanoflakes with bigger steps exhibit giant magnetoresistance, which suggests a strong influence of magnetic spin textures at the NiS2 surface on its electronic transport. These findings pave the way for the application of NiS2 nanoflakes in van der Waals heterostructures for low-temperature spintronics and superconducting spintronics.
publishDate 2023
dc.date.none.fl_str_mv 2023
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10366/168805
url http://hdl.handle.net/10366/168805
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv The Royal Society of Chemistry
publisher.none.fl_str_mv The Royal Society of Chemistry
dc.source.none.fl_str_mv reponame:GREDOS. Repositorio Institucional de la Universidad de Salamanca
instname:Universidad de Salamanca (USAL)
instname_str Universidad de Salamanca (USAL)
reponame_str GREDOS. Repositorio Institucional de la Universidad de Salamanca
collection GREDOS. Repositorio Institucional de la Universidad de Salamanca
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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