Anomalous out-of-equilibrium dynamics in the spin-ice material Dy<SUB>2</SUB>Ti<SUB>2</SUB>O<SUB>7</SUB> under moderate magnetic fields

Autores
Guruciaga, Pamela C.; Pili, L.; Boyeras Baldomá, Santiago; Slobinsky, Demian Gustavo; Grigera, Santiago Andrés; Borzi, Rodolfo Alberto
Año de publicación
2020
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We study experimentally and numerically the dynamics of the spin ice material Dy2Ti2O7 in the low temperature (T) and moderate magnetic field ( B ) regime (T ∈ [0.1, 1.7]  K, B ∈ [0, 0.3]  T). Our objective is to understand the main physics shaping the out-of-equilibrium magnetisation vs temperature curves in two different regimes. Very far from equilibrium, turning on the magnetic field after having cooled the system in zero field (ZFC) can increase the concentration of magnetic monopoles (localised thermal excitations present in these systems); this accelerates the dynamics. Similarly to electrolytes, this occurs through dissociation of bound monopole pairs. However, for spin ices the polarisation of the vacuum out of which the monopole pairs are created is a key factor shaping the magnetisation curves, with no analog. We observe a threshold field near 0.2 T for this fast dynamics to take place, linked to the maximum magnetic force between the attracting pairs. Surprisingly, within a regime of low temperatures and moderate fields, an extended Ohm's law can be used to describe the ZFC magnetisation curve obtained with the dipolar spin-ice model. However, in real samples the acceleration of the dynamics appears even sharper than in simulations, possibly due to the presence of avalanches. On the other hand, the effect of the field nearer equilibrium can be just the opposite to that at very low temperatures. Single crystals, as noted before for powders, abandon equilibrium at a blocking temperature T B which increases with field. Curiously, this behaviour is present in numerical simulations even within the nearest-neighbours interactions model. Simulations and experiments show that the increasing trend in T B is stronger for B ‖[100]. This suggests that the field plays a part in the dynamical arrest through monopole suppression, which is quite manifest for this field orientation.
Instituto de Física de Líquidos y Sistemas Biológicos
Materia
Física
spin ice
spin-ice dynamics
magnetic monopoles
low temperature
blocking temperature
dynamical freezing
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/128311

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spelling Anomalous out-of-equilibrium dynamics in the spin-ice material Dy<SUB>2</SUB>Ti<SUB>2</SUB>O<SUB>7</SUB> under moderate magnetic fieldsGuruciaga, Pamela C.Pili, L.Boyeras Baldomá, SantiagoSlobinsky, Demian GustavoGrigera, Santiago AndrésBorzi, Rodolfo AlbertoFísicaspin icespin-ice dynamicsmagnetic monopoleslow temperatureblocking temperaturedynamical freezingWe study experimentally and numerically the dynamics of the spin ice material Dy2Ti2O7 in the low temperature (T) and moderate magnetic field ( B ) regime (T ∈ [0.1, 1.7]  K, B ∈ [0, 0.3]  T). Our objective is to understand the main physics shaping the out-of-equilibrium magnetisation vs temperature curves in two different regimes. Very far from equilibrium, turning on the magnetic field after having cooled the system in zero field (ZFC) can increase the concentration of magnetic monopoles (localised thermal excitations present in these systems); this accelerates the dynamics. Similarly to electrolytes, this occurs through dissociation of bound monopole pairs. However, for spin ices the polarisation of the vacuum out of which the monopole pairs are created is a key factor shaping the magnetisation curves, with no analog. We observe a threshold field near 0.2 T for this fast dynamics to take place, linked to the maximum magnetic force between the attracting pairs. Surprisingly, within a regime of low temperatures and moderate fields, an extended Ohm's law can be used to describe the ZFC magnetisation curve obtained with the dipolar spin-ice model. However, in real samples the acceleration of the dynamics appears even sharper than in simulations, possibly due to the presence of avalanches. On the other hand, the effect of the field nearer equilibrium can be just the opposite to that at very low temperatures. Single crystals, as noted before for powders, abandon equilibrium at a blocking temperature T B which increases with field. Curiously, this behaviour is present in numerical simulations even within the nearest-neighbours interactions model. Simulations and experiments show that the increasing trend in T B is stronger for B ‖[100]. This suggests that the field plays a part in the dynamical arrest through monopole suppression, which is quite manifest for this field orientation.Instituto de Física de Líquidos y Sistemas Biológicos2020-06-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/128311enginfo:eu-repo/semantics/altIdentifier/issn/1361-648Xinfo:eu-repo/semantics/altIdentifier/issn/0953-8984info:eu-repo/semantics/altIdentifier/arxiv/2003.11088info:eu-repo/semantics/altIdentifier/pmid/32604086info:eu-repo/semantics/altIdentifier/doi/10.1088/1361-648x/aba153info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:30:57Zoai:sedici.unlp.edu.ar:10915/128311Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:30:58.097SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Anomalous out-of-equilibrium dynamics in the spin-ice material Dy<SUB>2</SUB>Ti<SUB>2</SUB>O<SUB>7</SUB> under moderate magnetic fields
title Anomalous out-of-equilibrium dynamics in the spin-ice material Dy<SUB>2</SUB>Ti<SUB>2</SUB>O<SUB>7</SUB> under moderate magnetic fields
spellingShingle Anomalous out-of-equilibrium dynamics in the spin-ice material Dy<SUB>2</SUB>Ti<SUB>2</SUB>O<SUB>7</SUB> under moderate magnetic fields
Guruciaga, Pamela C.
Física
spin ice
spin-ice dynamics
magnetic monopoles
low temperature
blocking temperature
dynamical freezing
title_short Anomalous out-of-equilibrium dynamics in the spin-ice material Dy<SUB>2</SUB>Ti<SUB>2</SUB>O<SUB>7</SUB> under moderate magnetic fields
title_full Anomalous out-of-equilibrium dynamics in the spin-ice material Dy<SUB>2</SUB>Ti<SUB>2</SUB>O<SUB>7</SUB> under moderate magnetic fields
title_fullStr Anomalous out-of-equilibrium dynamics in the spin-ice material Dy<SUB>2</SUB>Ti<SUB>2</SUB>O<SUB>7</SUB> under moderate magnetic fields
title_full_unstemmed Anomalous out-of-equilibrium dynamics in the spin-ice material Dy<SUB>2</SUB>Ti<SUB>2</SUB>O<SUB>7</SUB> under moderate magnetic fields
title_sort Anomalous out-of-equilibrium dynamics in the spin-ice material Dy<SUB>2</SUB>Ti<SUB>2</SUB>O<SUB>7</SUB> under moderate magnetic fields
dc.creator.none.fl_str_mv Guruciaga, Pamela C.
Pili, L.
Boyeras Baldomá, Santiago
Slobinsky, Demian Gustavo
Grigera, Santiago Andrés
Borzi, Rodolfo Alberto
author Guruciaga, Pamela C.
author_facet Guruciaga, Pamela C.
Pili, L.
Boyeras Baldomá, Santiago
Slobinsky, Demian Gustavo
Grigera, Santiago Andrés
Borzi, Rodolfo Alberto
author_role author
author2 Pili, L.
Boyeras Baldomá, Santiago
Slobinsky, Demian Gustavo
Grigera, Santiago Andrés
Borzi, Rodolfo Alberto
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Física
spin ice
spin-ice dynamics
magnetic monopoles
low temperature
blocking temperature
dynamical freezing
topic Física
spin ice
spin-ice dynamics
magnetic monopoles
low temperature
blocking temperature
dynamical freezing
dc.description.none.fl_txt_mv We study experimentally and numerically the dynamics of the spin ice material Dy2Ti2O7 in the low temperature (T) and moderate magnetic field ( B ) regime (T ∈ [0.1, 1.7]  K, B ∈ [0, 0.3]  T). Our objective is to understand the main physics shaping the out-of-equilibrium magnetisation vs temperature curves in two different regimes. Very far from equilibrium, turning on the magnetic field after having cooled the system in zero field (ZFC) can increase the concentration of magnetic monopoles (localised thermal excitations present in these systems); this accelerates the dynamics. Similarly to electrolytes, this occurs through dissociation of bound monopole pairs. However, for spin ices the polarisation of the vacuum out of which the monopole pairs are created is a key factor shaping the magnetisation curves, with no analog. We observe a threshold field near 0.2 T for this fast dynamics to take place, linked to the maximum magnetic force between the attracting pairs. Surprisingly, within a regime of low temperatures and moderate fields, an extended Ohm's law can be used to describe the ZFC magnetisation curve obtained with the dipolar spin-ice model. However, in real samples the acceleration of the dynamics appears even sharper than in simulations, possibly due to the presence of avalanches. On the other hand, the effect of the field nearer equilibrium can be just the opposite to that at very low temperatures. Single crystals, as noted before for powders, abandon equilibrium at a blocking temperature T B which increases with field. Curiously, this behaviour is present in numerical simulations even within the nearest-neighbours interactions model. Simulations and experiments show that the increasing trend in T B is stronger for B ‖[100]. This suggests that the field plays a part in the dynamical arrest through monopole suppression, which is quite manifest for this field orientation.
Instituto de Física de Líquidos y Sistemas Biológicos
description We study experimentally and numerically the dynamics of the spin ice material Dy2Ti2O7 in the low temperature (T) and moderate magnetic field ( B ) regime (T ∈ [0.1, 1.7]  K, B ∈ [0, 0.3]  T). Our objective is to understand the main physics shaping the out-of-equilibrium magnetisation vs temperature curves in two different regimes. Very far from equilibrium, turning on the magnetic field after having cooled the system in zero field (ZFC) can increase the concentration of magnetic monopoles (localised thermal excitations present in these systems); this accelerates the dynamics. Similarly to electrolytes, this occurs through dissociation of bound monopole pairs. However, for spin ices the polarisation of the vacuum out of which the monopole pairs are created is a key factor shaping the magnetisation curves, with no analog. We observe a threshold field near 0.2 T for this fast dynamics to take place, linked to the maximum magnetic force between the attracting pairs. Surprisingly, within a regime of low temperatures and moderate fields, an extended Ohm's law can be used to describe the ZFC magnetisation curve obtained with the dipolar spin-ice model. However, in real samples the acceleration of the dynamics appears even sharper than in simulations, possibly due to the presence of avalanches. On the other hand, the effect of the field nearer equilibrium can be just the opposite to that at very low temperatures. Single crystals, as noted before for powders, abandon equilibrium at a blocking temperature T B which increases with field. Curiously, this behaviour is present in numerical simulations even within the nearest-neighbours interactions model. Simulations and experiments show that the increasing trend in T B is stronger for B ‖[100]. This suggests that the field plays a part in the dynamical arrest through monopole suppression, which is quite manifest for this field orientation.
publishDate 2020
dc.date.none.fl_str_mv 2020-06-30
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/128311
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dc.language.none.fl_str_mv eng
language eng
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info:eu-repo/semantics/altIdentifier/issn/0953-8984
info:eu-repo/semantics/altIdentifier/arxiv/2003.11088
info:eu-repo/semantics/altIdentifier/pmid/32604086
info:eu-repo/semantics/altIdentifier/doi/10.1088/1361-648x/aba153
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
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