Tunable high-field magnetization in strongly exchange-coupled freestanding Co/CoO core/shell coaxial nanowires

The exchange bias properties of Co/CoO coaxial core/shell nanowires have been investigated with cooling and applied fields perpendicular to the wire axis. This configuration leads to unexpected exchange-bias effects. Firstly, the magnetization value at high fields is found to depend on the field-coo...

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Autores: Salazar Álvarez, Germán|||0000-0002-0671-435X, Geshev, Julian|||0000-0003-3730-3657, Agramunt Puig, Sebastià|||0000-0002-3627-2820, Navau, Carles|||0000-0003-4763-5305, Sánchez Moreno, Álvaro|||0000-0002-2988-0289, Sort, Jordi|||0000-0003-1213-3639, Nogués, Josep|||0000-0003-4616-1371
Tipo de recurso: artículo
Fecha de publicación:2016
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:170261
Acceso en línea:https://ddd.uab.cat/record/170261
https://dx.doi.org/urn:doi:10.1021/acsami.6b05588
Access Level:acceso abierto
Palabra clave:Coaxial nanowires
Exchange bias
CoO
Uncopmpensated spins
Training effects
High field irreversibility
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spelling Tunable high-field magnetization in strongly exchange-coupled freestanding Co/CoO core/shell coaxial nanowiresSalazar Álvarez, Germán|||0000-0002-0671-435XGeshev, Julian|||0000-0003-3730-3657Agramunt Puig, Sebastià|||0000-0002-3627-2820Navau, Carles|||0000-0003-4763-5305Sánchez Moreno, Álvaro|||0000-0002-2988-0289Sort, Jordi|||0000-0003-1213-3639Nogués, Josep|||0000-0003-4616-1371Coaxial nanowiresExchange biasCoOUncopmpensated spinsTraining effectsHigh field irreversibilityThe exchange bias properties of Co/CoO coaxial core/shell nanowires have been investigated with cooling and applied fields perpendicular to the wire axis. This configuration leads to unexpected exchange-bias effects. Firstly, the magnetization value at high fields is found to depend on the field-cooling conditions. This effect arises from the competition between the magnetic anisotropy and the Zeeman energies for cooling fields perpendicular to the wire axis. This allows imprinting pre-defined magnetization states to the AFM, as corroborated by micromagnetic simulations. Secondly, the system exhibits a high-field magnetic irreversibility, leading to open hysteresis loops, attributed to the AFM easy-axis reorientation during the reversal (effect similar to athermal training). A distinct way to manipulate the high-field magnetization in exchange-biased systems, beyond the archetypical effects, is thus experimentally and theoretically demonstrated. 22016-01-0120162016-01-01Articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/170261https://dx.doi.org/urn:doi:10.1021/acsami.6b05588reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengEuropean Commission https://doi.org/10.13039/501100000780 296679Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2013-0295Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 MAT2012-35370Agència de Gestió d'Ajuts Universitaris i de Recerca https://doi.org/10.13039/501100003030 2014/SGR-1015Agència de Gestió d'Ajuts Universitaris i de Recerca https://doi.org/10.13039/501100003030 2014/SGR-150open accesshttp://purl.org/coar/access_right/c_abf2Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.https://rightsstatements.org/vocab/InC/1.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:1702612026-06-06T12:50:31Z
dc.title.none.fl_str_mv Tunable high-field magnetization in strongly exchange-coupled freestanding Co/CoO core/shell coaxial nanowires
title Tunable high-field magnetization in strongly exchange-coupled freestanding Co/CoO core/shell coaxial nanowires
spellingShingle Tunable high-field magnetization in strongly exchange-coupled freestanding Co/CoO core/shell coaxial nanowires
Salazar Álvarez, Germán|||0000-0002-0671-435X
Coaxial nanowires
Exchange bias
CoO
Uncopmpensated spins
Training effects
High field irreversibility
title_short Tunable high-field magnetization in strongly exchange-coupled freestanding Co/CoO core/shell coaxial nanowires
title_full Tunable high-field magnetization in strongly exchange-coupled freestanding Co/CoO core/shell coaxial nanowires
title_fullStr Tunable high-field magnetization in strongly exchange-coupled freestanding Co/CoO core/shell coaxial nanowires
title_full_unstemmed Tunable high-field magnetization in strongly exchange-coupled freestanding Co/CoO core/shell coaxial nanowires
title_sort Tunable high-field magnetization in strongly exchange-coupled freestanding Co/CoO core/shell coaxial nanowires
dc.creator.none.fl_str_mv Salazar Álvarez, Germán|||0000-0002-0671-435X
Geshev, Julian|||0000-0003-3730-3657
Agramunt Puig, Sebastià|||0000-0002-3627-2820
Navau, Carles|||0000-0003-4763-5305
Sánchez Moreno, Álvaro|||0000-0002-2988-0289
Sort, Jordi|||0000-0003-1213-3639
Nogués, Josep|||0000-0003-4616-1371
author Salazar Álvarez, Germán|||0000-0002-0671-435X
author_facet Salazar Álvarez, Germán|||0000-0002-0671-435X
Geshev, Julian|||0000-0003-3730-3657
Agramunt Puig, Sebastià|||0000-0002-3627-2820
Navau, Carles|||0000-0003-4763-5305
Sánchez Moreno, Álvaro|||0000-0002-2988-0289
Sort, Jordi|||0000-0003-1213-3639
Nogués, Josep|||0000-0003-4616-1371
author_role author
author2 Geshev, Julian|||0000-0003-3730-3657
Agramunt Puig, Sebastià|||0000-0002-3627-2820
Navau, Carles|||0000-0003-4763-5305
Sánchez Moreno, Álvaro|||0000-0002-2988-0289
Sort, Jordi|||0000-0003-1213-3639
Nogués, Josep|||0000-0003-4616-1371
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Coaxial nanowires
Exchange bias
CoO
Uncopmpensated spins
Training effects
High field irreversibility
topic Coaxial nanowires
Exchange bias
CoO
Uncopmpensated spins
Training effects
High field irreversibility
description The exchange bias properties of Co/CoO coaxial core/shell nanowires have been investigated with cooling and applied fields perpendicular to the wire axis. This configuration leads to unexpected exchange-bias effects. Firstly, the magnetization value at high fields is found to depend on the field-cooling conditions. This effect arises from the competition between the magnetic anisotropy and the Zeeman energies for cooling fields perpendicular to the wire axis. This allows imprinting pre-defined magnetization states to the AFM, as corroborated by micromagnetic simulations. Secondly, the system exhibits a high-field magnetic irreversibility, leading to open hysteresis loops, attributed to the AFM easy-axis reorientation during the reversal (effect similar to athermal training). A distinct way to manipulate the high-field magnetization in exchange-biased systems, beyond the archetypical effects, is thus experimentally and theoretically demonstrated.
publishDate 2016
dc.date.none.fl_str_mv 2
2016-01-01
2016
2016-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/170261
https://dx.doi.org/urn:doi:10.1021/acsami.6b05588
url https://ddd.uab.cat/record/170261
https://dx.doi.org/urn:doi:10.1021/acsami.6b05588
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv European Commission https://doi.org/10.13039/501100000780 296679
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2013-0295
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 MAT2012-35370
Agència de Gestió d'Ajuts Universitaris i de Recerca https://doi.org/10.13039/501100003030 2014/SGR-1015
Agència de Gestió d'Ajuts Universitaris i de Recerca https://doi.org/10.13039/501100003030 2014/SGR-150
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://rightsstatements.org/vocab/InC/1.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://rightsstatements.org/vocab/InC/1.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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