Stable magnetic droplet solitons in spin-transfer nanocontacts

Magnetic thin films with perpendicular magnetic anisotropy (PMA) have localized excitations that correspond to reversed dynamically precessing magnetic moments, known as magnetic droplet solitons. Fundamentally, these excitations are associated with an attractive interaction between elementary spin-...

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Detalles Bibliográficos
Autores: Macià Bros, Ferran, Backes, D., Kent, A. D.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2014
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/159775
Acceso en línea:https://hdl.handle.net/2445/159775
Access Level:acceso abierto
Palabra clave:Spin (Física nuclear)
Ferromagnetisme
Anisotropia
Pel·lícules fines
Nuclear spin
Ferromagnetism
Anisotropy
Thin films
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spelling Stable magnetic droplet solitons in spin-transfer nanocontactsMacià Bros, FerranBackes, D.Kent, A. D.Spin (Física nuclear)FerromagnetismeAnisotropiaPel·lícules finesNuclear spinFerromagnetismAnisotropyThin filmsMagnetic thin films with perpendicular magnetic anisotropy (PMA) have localized excitations that correspond to reversed dynamically precessing magnetic moments, known as magnetic droplet solitons. Fundamentally, these excitations are associated with an attractive interaction between elementary spin-excitations (i.e., magnons) and were predicted to occur in PMA materials in the absence of damping [1, 2]. While damping, present in all magnetic materials, suppresses these excitations, it is now possible to compensate damping by spin transfer torques through electrical current flow in nanometer scale contacts to ferromagnetic thin films [3, 4]. A theory predicts the appearance of magnetic droplet solitons at a threshold current in nanocontacts [5] and, recently, experimental signatures of droplet nucleation have been reported [6]. However, thus far, they have been observed to be nearly reversible excitations, with only partially reversed magnetization and to be subject to instabilities that cause them to drift away from the nanocontacts (i.e., drift instabilities) [6]. Here we show that magnetic droplet solitons can be stabilized in a spin transfer nanocontact. Further, they exhibit a strong hysteretic response to fields and currents and a nearly fully reversed magnetization in the contact. These observations, in addition to their fundamental interest, open up new applications for magnetic droplet solitons as multi-state high frequency current and field tunable oscillators.Nature Publishing Group2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/159775Articles publicats en revistes (Física de la Matèria Condensada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1038/nnano.2014.255Nature Nanotechnology, 2014, vol. 9, p. 992-996https://doi.org/10.1038/nnano.2014.255info:eu-repo/grantAgreement/EC/FP7/253214(c) Macià Bros, Ferran et al., 2014info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1597752026-05-27T06:46:51Z
dc.title.none.fl_str_mv Stable magnetic droplet solitons in spin-transfer nanocontacts
title Stable magnetic droplet solitons in spin-transfer nanocontacts
spellingShingle Stable magnetic droplet solitons in spin-transfer nanocontacts
Macià Bros, Ferran
Spin (Física nuclear)
Ferromagnetisme
Anisotropia
Pel·lícules fines
Nuclear spin
Ferromagnetism
Anisotropy
Thin films
title_short Stable magnetic droplet solitons in spin-transfer nanocontacts
title_full Stable magnetic droplet solitons in spin-transfer nanocontacts
title_fullStr Stable magnetic droplet solitons in spin-transfer nanocontacts
title_full_unstemmed Stable magnetic droplet solitons in spin-transfer nanocontacts
title_sort Stable magnetic droplet solitons in spin-transfer nanocontacts
dc.creator.none.fl_str_mv Macià Bros, Ferran
Backes, D.
Kent, A. D.
author Macià Bros, Ferran
author_facet Macià Bros, Ferran
Backes, D.
Kent, A. D.
author_role author
author2 Backes, D.
Kent, A. D.
author2_role author
author
dc.subject.none.fl_str_mv Spin (Física nuclear)
Ferromagnetisme
Anisotropia
Pel·lícules fines
Nuclear spin
Ferromagnetism
Anisotropy
Thin films
topic Spin (Física nuclear)
Ferromagnetisme
Anisotropia
Pel·lícules fines
Nuclear spin
Ferromagnetism
Anisotropy
Thin films
description Magnetic thin films with perpendicular magnetic anisotropy (PMA) have localized excitations that correspond to reversed dynamically precessing magnetic moments, known as magnetic droplet solitons. Fundamentally, these excitations are associated with an attractive interaction between elementary spin-excitations (i.e., magnons) and were predicted to occur in PMA materials in the absence of damping [1, 2]. While damping, present in all magnetic materials, suppresses these excitations, it is now possible to compensate damping by spin transfer torques through electrical current flow in nanometer scale contacts to ferromagnetic thin films [3, 4]. A theory predicts the appearance of magnetic droplet solitons at a threshold current in nanocontacts [5] and, recently, experimental signatures of droplet nucleation have been reported [6]. However, thus far, they have been observed to be nearly reversible excitations, with only partially reversed magnetization and to be subject to instabilities that cause them to drift away from the nanocontacts (i.e., drift instabilities) [6]. Here we show that magnetic droplet solitons can be stabilized in a spin transfer nanocontact. Further, they exhibit a strong hysteretic response to fields and currents and a nearly fully reversed magnetization in the contact. These observations, in addition to their fundamental interest, open up new applications for magnetic droplet solitons as multi-state high frequency current and field tunable oscillators.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/159775
url https://hdl.handle.net/2445/159775
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1038/nnano.2014.255
Nature Nanotechnology, 2014, vol. 9, p. 992-996
https://doi.org/10.1038/nnano.2014.255
info:eu-repo/grantAgreement/EC/FP7/253214
dc.rights.none.fl_str_mv (c) Macià Bros, Ferran et al., 2014
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Macià Bros, Ferran et al., 2014
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Nature Publishing Group
publisher.none.fl_str_mv Nature Publishing Group
dc.source.none.fl_str_mv Articles publicats en revistes (Física de la Matèria Condensada)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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