Inverse transition in the dipolar frustrated Ising ferromagnet : the role of domain walls

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We present a theoretical study aimed at elucidating the origin of the inverse symmetry-breaking transition observed in ultrathin magnetic films with perpendicular anisotropy. We study the behavior of the dipolar frustrated Ising model in a mean field approximation as well as two other models with si...

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Autores principales: Araújo Velasque, Luciana, Stariolo, Daniel Adrián, Billoni, Orlando Vito
Formato: article
Lenguaje:Inglés
Publicado: 2021
Materias:
Inverse symmetry-breaking
Ultrathin
Magnetic
Films
Acceso en línea:http://hdl.handle.net/11086/20783
https://doi.org/10.1103/PhysRevB.90.214408
Aporte de:
Repositorio Digital Universitario (UNC) de Universidad Nacional de Córdoba
id I10-R141-11086-20783
record_format dspace
institution Universidad Nacional de Córdoba
institution_str I-10
repository_str R-141
collection Repositorio Digital Universitario (UNC)
language Inglés
topic Inverse symmetry-breaking
Ultrathin
Magnetic
Films
spellingShingle Inverse symmetry-breaking
Ultrathin
Magnetic
Films
Araújo Velasque, Luciana
Stariolo, Daniel Adrián
Billoni, Orlando Vito
Inverse transition in the dipolar frustrated Ising ferromagnet : the role of domain walls
topic_facet Inverse symmetry-breaking
Ultrathin
Magnetic
Films
description We present a theoretical study aimed at elucidating the origin of the inverse symmetry-breaking transition observed in ultrathin magnetic films with perpendicular anisotropy. We study the behavior of the dipolar frustrated Ising model in a mean field approximation as well as two other models with simple domain walls. By a numerical analysis we show that the internal degrees of freedom of the domain walls are decisive for the presence of the inverse symmetry-breaking transition. In particular, we show that in a sharp domain wall model the inverse transition is absent. At high temperatures the additional degrees of freedom of the extended domain walls increase the entropy of the system leading to a reduction of the free energy of the stripe phase. Upon lowering the temperature the domain walls become narrow, and the reduction of the number of degrees of freedom associated with them manifests in a reduction of entropy which eventually induces an inverse transition to the competing homogenous phase. We also show that, for a growing external field at constant temperature, the stripe width grows strongly when approaching the critical field line and diverges at the transition. These results indicate that the inverse transition is a continuous phase transition and that the domain wall profiles and the temperature have little effect on the critical behavior of the period of the domain as a function of the applied field.
format article
author Araújo Velasque, Luciana
Stariolo, Daniel Adrián
Billoni, Orlando Vito
author_facet Araújo Velasque, Luciana
Stariolo, Daniel Adrián
Billoni, Orlando Vito
author_sort Araújo Velasque, Luciana
title Inverse transition in the dipolar frustrated Ising ferromagnet : the role of domain walls
title_short Inverse transition in the dipolar frustrated Ising ferromagnet : the role of domain walls
title_full Inverse transition in the dipolar frustrated Ising ferromagnet : the role of domain walls
title_fullStr Inverse transition in the dipolar frustrated Ising ferromagnet : the role of domain walls
title_full_unstemmed Inverse transition in the dipolar frustrated Ising ferromagnet : the role of domain walls
title_sort inverse transition in the dipolar frustrated ising ferromagnet : the role of domain walls
publishDate 2021
url http://hdl.handle.net/11086/20783
https://doi.org/10.1103/PhysRevB.90.214408
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