Topological theory of magnetism in nanostructured ferromagnets
Autor(a) principal: | |
---|---|
Data de Publicação: | 1994 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/104216 |
Resumo: | It is postulated that in nanostructured ferromagnets, e.g., Ni, Fe, and Co, exchange and magnetostatic energy dominate crystalline anisotropy energy and therefore the usual domain structure imposed via anisotropy is replaced by a structure consisting of topological defects. The defects are nonlinear solutions of the classical Heisenberg Hamiltonian of spins modified by magnetostatic energy, have the topological properties of disclinations, and are partly classified by the Hopf index. Coercive force is a consequence of entanglements of disclinations, pinning, and mutual obstruction during crossing processes correlated to local (spin) conductivity. Domain boundaries at surfaces are replaced by topological point defects of opposite topological charge generated pairwise. |
id |
UFRGS-2_14caeb9c7def0f147bf01cf78ab753a0 |
---|---|
oai_identifier_str |
oai:www.lume.ufrgs.br:10183/104216 |
network_acronym_str |
UFRGS-2 |
network_name_str |
Repositório Institucional da UFRGS |
repository_id_str |
|
spelling |
Holz, ArnoScherer, Claudio2014-10-07T02:11:22Z19940163-1829http://hdl.handle.net/10183/104216000220506It is postulated that in nanostructured ferromagnets, e.g., Ni, Fe, and Co, exchange and magnetostatic energy dominate crystalline anisotropy energy and therefore the usual domain structure imposed via anisotropy is replaced by a structure consisting of topological defects. The defects are nonlinear solutions of the classical Heisenberg Hamiltonian of spins modified by magnetostatic energy, have the topological properties of disclinations, and are partly classified by the Hopf index. Coercive force is a consequence of entanglements of disclinations, pinning, and mutual obstruction during crossing processes correlated to local (spin) conductivity. Domain boundaries at surfaces are replaced by topological point defects of opposite topological charge generated pairwise.application/pdfengPhysical review. B, Condensed matter. New York. Vol. 50, no. 9 (Sept. 1994), p. 6209-6232Física da matéria condensadaMateria condensadaMateriais ferromagnéticosMagnetismoSuperficiesDefeitos puntuaisMagnetizaçãoAnisotropia magnéticaTopological theory of magnetism in nanostructured ferromagnetsEstrangeiroinfo: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:UFRGSORIGINAL000220506.pdf000220506.pdfTexto completo (inglês)application/pdf4344520http://www.lume.ufrgs.br/bitstream/10183/104216/1/000220506.pdf28449785eeb5c7e48fab33b9102efdd7MD51TEXT000220506.pdf.txt000220506.pdf.txtExtracted Texttext/plain130490http://www.lume.ufrgs.br/bitstream/10183/104216/2/000220506.pdf.txte610c62000ce70994d236883fac6dd85MD5210183/1042162023-07-21 03:31:13.968362oai:www.lume.ufrgs.br:10183/104216Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-21T06:31:13Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Topological theory of magnetism in nanostructured ferromagnets |
title |
Topological theory of magnetism in nanostructured ferromagnets |
spellingShingle |
Topological theory of magnetism in nanostructured ferromagnets Holz, Arno Física da matéria condensada Materia condensada Materiais ferromagnéticos Magnetismo Superficies Defeitos puntuais Magnetização Anisotropia magnética |
title_short |
Topological theory of magnetism in nanostructured ferromagnets |
title_full |
Topological theory of magnetism in nanostructured ferromagnets |
title_fullStr |
Topological theory of magnetism in nanostructured ferromagnets |
title_full_unstemmed |
Topological theory of magnetism in nanostructured ferromagnets |
title_sort |
Topological theory of magnetism in nanostructured ferromagnets |
author |
Holz, Arno |
author_facet |
Holz, Arno Scherer, Claudio |
author_role |
author |
author2 |
Scherer, Claudio |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Holz, Arno Scherer, Claudio |
dc.subject.por.fl_str_mv |
Física da matéria condensada Materia condensada Materiais ferromagnéticos Magnetismo Superficies Defeitos puntuais Magnetização Anisotropia magnética |
topic |
Física da matéria condensada Materia condensada Materiais ferromagnéticos Magnetismo Superficies Defeitos puntuais Magnetização Anisotropia magnética |
description |
It is postulated that in nanostructured ferromagnets, e.g., Ni, Fe, and Co, exchange and magnetostatic energy dominate crystalline anisotropy energy and therefore the usual domain structure imposed via anisotropy is replaced by a structure consisting of topological defects. The defects are nonlinear solutions of the classical Heisenberg Hamiltonian of spins modified by magnetostatic energy, have the topological properties of disclinations, and are partly classified by the Hopf index. Coercive force is a consequence of entanglements of disclinations, pinning, and mutual obstruction during crossing processes correlated to local (spin) conductivity. Domain boundaries at surfaces are replaced by topological point defects of opposite topological charge generated pairwise. |
publishDate |
1994 |
dc.date.issued.fl_str_mv |
1994 |
dc.date.accessioned.fl_str_mv |
2014-10-07T02:11:22Z |
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/10183/104216 |
dc.identifier.issn.pt_BR.fl_str_mv |
0163-1829 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000220506 |
identifier_str_mv |
0163-1829 000220506 |
url |
http://hdl.handle.net/10183/104216 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. B, Condensed matter. New York. Vol. 50, no. 9 (Sept. 1994), p. 6209-6232 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFRGS instname:Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
instname_str |
Universidade Federal do Rio Grande do Sul (UFRGS) |
instacron_str |
UFRGS |
institution |
UFRGS |
reponame_str |
Repositório Institucional da UFRGS |
collection |
Repositório Institucional da UFRGS |
bitstream.url.fl_str_mv |
http://www.lume.ufrgs.br/bitstream/10183/104216/1/000220506.pdf http://www.lume.ufrgs.br/bitstream/10183/104216/2/000220506.pdf.txt |
bitstream.checksum.fl_str_mv |
28449785eeb5c7e48fab33b9102efdd7 e610c62000ce70994d236883fac6dd85 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS) |
repository.mail.fl_str_mv |
|
_version_ |
1801224852494876672 |