Rotational dynamics of magnetic particles in suspensions

Detalhes bibliográficos
Autor(a) principal: Scherer, Claudio
Data de Publicação: 2001
Outros Autores: Matuttis, Hans-Georg
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/103653
Resumo: An approach for the rotational dynamics of magnetic particles and their magnetic moments, in fluid suspensions, is developed. A possible application is to magnetic resonance in ferrofluids. Based on a generalized Lagrangian formulation for the equations of motion of the particle, we introduce its interaction with the solvent fluid via dissipative and random noise torques, as well as the interaction between the particle and its magnetic moment, treated as an independent physical entity and characterized by three generalized coordinates: its two polar angles and its modulus. In the appropriate limits, it reduces to the cases of superparamagnetic particles or nonsuperparamagnetic (blocked magnetic moments) particles. It is also indicated how the dynamic complex susceptibility may be calculated from the equations of motion, and as an example the effect of the particles inertia on the susceptibility is numerically evaluated for some arbitrary values of the parameters.
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spelling Scherer, ClaudioMatuttis, Hans-Georg2014-09-23T02:12:39Z20011539-3755http://hdl.handle.net/10183/103653000281951An approach for the rotational dynamics of magnetic particles and their magnetic moments, in fluid suspensions, is developed. A possible application is to magnetic resonance in ferrofluids. Based on a generalized Lagrangian formulation for the equations of motion of the particle, we introduce its interaction with the solvent fluid via dissipative and random noise torques, as well as the interaction between the particle and its magnetic moment, treated as an independent physical entity and characterized by three generalized coordinates: its two polar angles and its modulus. In the appropriate limits, it reduces to the cases of superparamagnetic particles or nonsuperparamagnetic (blocked magnetic moments) particles. It is also indicated how the dynamic complex susceptibility may be calculated from the equations of motion, and as an example the effect of the particles inertia on the susceptibility is numerically evaluated for some arbitrary values of the parameters.application/pdfengPhysical review. E, Statistical, nonlinear, and soft matter physics. Vol. 63, no. 1 (Jan. 2001), 011504, 7 p.FísicaRotational dynamics of magnetic particles in suspensionsEstrangeiroinfo: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:UFRGSORIGINAL000281951.pdf000281951.pdfTexto completo (inglês)application/pdf94358http://www.lume.ufrgs.br/bitstream/10183/103653/1/000281951.pdf9fc75eab91184c49a343119665ab65fdMD51TEXT000281951.pdf.txt000281951.pdf.txtExtracted Texttext/plain31125http://www.lume.ufrgs.br/bitstream/10183/103653/2/000281951.pdf.txt2aad5020673601edbbf2f23e18a0514bMD52THUMBNAIL000281951.pdf.jpg000281951.pdf.jpgGenerated Thumbnailimage/jpeg1955http://www.lume.ufrgs.br/bitstream/10183/103653/3/000281951.pdf.jpgf0dd84af4f0f529835dce31f87870b87MD5310183/1036532023-07-21 03:31:20.480579oai:www.lume.ufrgs.br:10183/103653Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-21T06:31:20Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Rotational dynamics of magnetic particles in suspensions
title Rotational dynamics of magnetic particles in suspensions
spellingShingle Rotational dynamics of magnetic particles in suspensions
Scherer, Claudio
Física
title_short Rotational dynamics of magnetic particles in suspensions
title_full Rotational dynamics of magnetic particles in suspensions
title_fullStr Rotational dynamics of magnetic particles in suspensions
title_full_unstemmed Rotational dynamics of magnetic particles in suspensions
title_sort Rotational dynamics of magnetic particles in suspensions
author Scherer, Claudio
author_facet Scherer, Claudio
Matuttis, Hans-Georg
author_role author
author2 Matuttis, Hans-Georg
author2_role author
dc.contributor.author.fl_str_mv Scherer, Claudio
Matuttis, Hans-Georg
dc.subject.por.fl_str_mv Física
topic Física
description An approach for the rotational dynamics of magnetic particles and their magnetic moments, in fluid suspensions, is developed. A possible application is to magnetic resonance in ferrofluids. Based on a generalized Lagrangian formulation for the equations of motion of the particle, we introduce its interaction with the solvent fluid via dissipative and random noise torques, as well as the interaction between the particle and its magnetic moment, treated as an independent physical entity and characterized by three generalized coordinates: its two polar angles and its modulus. In the appropriate limits, it reduces to the cases of superparamagnetic particles or nonsuperparamagnetic (blocked magnetic moments) particles. It is also indicated how the dynamic complex susceptibility may be calculated from the equations of motion, and as an example the effect of the particles inertia on the susceptibility is numerically evaluated for some arbitrary values of the parameters.
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dc.date.issued.fl_str_mv 2001
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dc.relation.ispartof.pt_BR.fl_str_mv Physical review. E, Statistical, nonlinear, and soft matter physics. Vol. 63, no. 1 (Jan. 2001), 011504, 7 p.
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