Langevin simulations of model for ultrathin magnetic films
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/104511 |
Resumo: | We show results from simulations of the Langevin dynamics of a two-dimensional scalar model with competing interactions for ultrathin magnetic films. We find a phase transition from a high temperature disordered phase to a low temperature phase with both translational and orientational orders. Both kinds of order emerge at the same temperature, probably due to the isotropy of the model Hamiltonian. In the low temperature phase, orientational correlations show long-range order while translational ones show only quasi-long-range order in a wide temperature range. The orientational correlation length and the associated susceptibility seem to diverge with power laws at the transition. While at zero temperature the system exhibits stripe long-range order, as temperature grows, we observe the proliferation of different kinds of topological defects that ultimately drive the system to the disordered phase. The magnetic structures observed are similar to experimental results on ultrathin ferromagnetic films. |
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Nicolao, LucasStariolo, Daniel Adrian2014-10-14T02:12:58Z20071098-0121http://hdl.handle.net/10183/104511000604355We show results from simulations of the Langevin dynamics of a two-dimensional scalar model with competing interactions for ultrathin magnetic films. We find a phase transition from a high temperature disordered phase to a low temperature phase with both translational and orientational orders. Both kinds of order emerge at the same temperature, probably due to the isotropy of the model Hamiltonian. In the low temperature phase, orientational correlations show long-range order while translational ones show only quasi-long-range order in a wide temperature range. The orientational correlation length and the associated susceptibility seem to diverge with power laws at the transition. While at zero temperature the system exhibits stripe long-range order, as temperature grows, we observe the proliferation of different kinds of topological defects that ultimately drive the system to the disordered phase. The magnetic structures observed are similar to experimental results on ultrathin ferromagnetic films.application/pdfengPhysical review. B, Condensed matter and materials physics. Woodbury. Vol. 76, no. 5 (Aug. 2007), 054453 9p.Equação de LangevinPropriedades magneticas de filmes finosLangevin simulations of model for ultrathin magnetic filmsEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000604355.pdf000604355.pdfTexto completo (inglês)application/pdf4245001http://www.lume.ufrgs.br/bitstream/10183/104511/1/000604355.pdfd28671dec885016d235bd82af53a1431MD51TEXT000604355.pdf.txt000604355.pdf.txtExtracted Texttext/plain39990http://www.lume.ufrgs.br/bitstream/10183/104511/2/000604355.pdf.txt9203f55611b19857c3f2c6e930a5fa9eMD52THUMBNAIL000604355.pdf.jpg000604355.pdf.jpgGenerated Thumbnailimage/jpeg2029http://www.lume.ufrgs.br/bitstream/10183/104511/3/000604355.pdf.jpg25dbe4ac2ea6bd9be4202d3860f8ec45MD5310183/1045112018-10-10 07:58:46.34oai:www.lume.ufrgs.br:10183/104511Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-10T10:58:46Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Langevin simulations of model for ultrathin magnetic films |
title |
Langevin simulations of model for ultrathin magnetic films |
spellingShingle |
Langevin simulations of model for ultrathin magnetic films Nicolao, Lucas Equação de Langevin Propriedades magneticas de filmes finos |
title_short |
Langevin simulations of model for ultrathin magnetic films |
title_full |
Langevin simulations of model for ultrathin magnetic films |
title_fullStr |
Langevin simulations of model for ultrathin magnetic films |
title_full_unstemmed |
Langevin simulations of model for ultrathin magnetic films |
title_sort |
Langevin simulations of model for ultrathin magnetic films |
author |
Nicolao, Lucas |
author_facet |
Nicolao, Lucas Stariolo, Daniel Adrian |
author_role |
author |
author2 |
Stariolo, Daniel Adrian |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Nicolao, Lucas Stariolo, Daniel Adrian |
dc.subject.por.fl_str_mv |
Equação de Langevin Propriedades magneticas de filmes finos |
topic |
Equação de Langevin Propriedades magneticas de filmes finos |
description |
We show results from simulations of the Langevin dynamics of a two-dimensional scalar model with competing interactions for ultrathin magnetic films. We find a phase transition from a high temperature disordered phase to a low temperature phase with both translational and orientational orders. Both kinds of order emerge at the same temperature, probably due to the isotropy of the model Hamiltonian. In the low temperature phase, orientational correlations show long-range order while translational ones show only quasi-long-range order in a wide temperature range. The orientational correlation length and the associated susceptibility seem to diverge with power laws at the transition. While at zero temperature the system exhibits stripe long-range order, as temperature grows, we observe the proliferation of different kinds of topological defects that ultimately drive the system to the disordered phase. The magnetic structures observed are similar to experimental results on ultrathin ferromagnetic films. |
publishDate |
2007 |
dc.date.issued.fl_str_mv |
2007 |
dc.date.accessioned.fl_str_mv |
2014-10-14T02:12:58Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/104511 |
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1098-0121 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000604355 |
identifier_str_mv |
1098-0121 000604355 |
url |
http://hdl.handle.net/10183/104511 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 76, no. 5 (Aug. 2007), 054453 9p. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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