Langevin simulations of model for ultrathin magnetic films

Detalhes bibliográficos
Autor(a) principal: Nicolao, Lucas
Data de Publicação: 2007
Outros Autores: Stariolo, Daniel Adrian
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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spelling 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.
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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.
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