Evidence for resonant tunneling of magnetization in Mn12 acetate complex

We have measured the dc magnetization at low temperatures of tetragonal crystals of Mn12 acetate complex [Mn12O12[CH3COO]16[H2O]4], a material composed of a large ~Avogadro’s! number of identical magnetic molecules, each of spin 10. Exchange coupling between Mn ions within each molecule is very stro...

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Detalhes bibliográficos
Autores: Hernández Ferràs, Joan Manel, Zhang, Xixiang, Luis Vitalla, Fernando, Tejada Palacios, Javier, Friedman, Jonathan R., Sarachik, M. P., Ziolo, R. F.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:1997
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositório:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/10656
Acesso em linha:https://hdl.handle.net/2445/10656
Access Level:Acceso aberto
Palavra-chave:Materials magnètics
Propietats magnètiques
Magnetic properties
Magnetic materials
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spelling Evidence for resonant tunneling of magnetization in Mn12 acetate complexHernández Ferràs, Joan ManelZhang, XixiangLuis Vitalla, FernandoTejada Palacios, JavierFriedman, Jonathan R.Sarachik, M. P.Ziolo, R. F.Materials magnèticsPropietats magnètiquesMagnetic propertiesMagnetic materialsWe have measured the dc magnetization at low temperatures of tetragonal crystals of Mn12 acetate complex [Mn12O12[CH3COO]16[H2O]4], a material composed of a large ~Avogadro’s! number of identical magnetic molecules, each of spin 10. Exchange coupling between Mn ions within each molecule is very strong, while the interaction between molecules is negligible. A large, uniaxial anisotropy ~;60 K! gives rise to a doubly degenerate ground state corresponding to spin projections of 610 along the easy axis ~c axis!; hysteretic behavior is found below a blocking temperature Tb;3 K. Based on measurements of oriented crystallites at temperatures between 1.7 and 3.2 K, we report strong evidence for resonant tunneling of the magnetization: periodic steps in the hysteresis loop, and periodic marked increases in the magnetic relaxation rate at the magnetic fields corresponding to these steps. A total of seven increases in the relaxation rate were found within the temperature range of our experiments with a period of 0.46 T; we suggest that many more such steps would be found at lower temperatures. We attribute these observations to thermally assisted resonant tunneling of the magnetization and propose a detailed model to account for our results.The American Physical Society200920091997info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion8 p.application/pdfhttps://hdl.handle.net/2445/10656Articles publicats en revistes (Física de la Matèria Condensada)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.55.5858Physical Review B, 1997, vol. 55, núm. 9, p. 5858-5865.http://dx.doi.org/10.1103/PhysRevB.55.5858(c) The American Physical Society, 1997info:eu-repo/semantics/openAccessoai:recercat.cat:2445/106562026-05-29T05:05:01Z
dc.title.none.fl_str_mv Evidence for resonant tunneling of magnetization in Mn12 acetate complex
title Evidence for resonant tunneling of magnetization in Mn12 acetate complex
spellingShingle Evidence for resonant tunneling of magnetization in Mn12 acetate complex
Hernández Ferràs, Joan Manel
Materials magnètics
Propietats magnètiques
Magnetic properties
Magnetic materials
title_short Evidence for resonant tunneling of magnetization in Mn12 acetate complex
title_full Evidence for resonant tunneling of magnetization in Mn12 acetate complex
title_fullStr Evidence for resonant tunneling of magnetization in Mn12 acetate complex
title_full_unstemmed Evidence for resonant tunneling of magnetization in Mn12 acetate complex
title_sort Evidence for resonant tunneling of magnetization in Mn12 acetate complex
dc.creator.none.fl_str_mv Hernández Ferràs, Joan Manel
Zhang, Xixiang
Luis Vitalla, Fernando
Tejada Palacios, Javier
Friedman, Jonathan R.
Sarachik, M. P.
Ziolo, R. F.
author Hernández Ferràs, Joan Manel
author_facet Hernández Ferràs, Joan Manel
Zhang, Xixiang
Luis Vitalla, Fernando
Tejada Palacios, Javier
Friedman, Jonathan R.
Sarachik, M. P.
Ziolo, R. F.
author_role author
author2 Zhang, Xixiang
Luis Vitalla, Fernando
Tejada Palacios, Javier
Friedman, Jonathan R.
Sarachik, M. P.
Ziolo, R. F.
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Materials magnètics
Propietats magnètiques
Magnetic properties
Magnetic materials
topic Materials magnètics
Propietats magnètiques
Magnetic properties
Magnetic materials
description We have measured the dc magnetization at low temperatures of tetragonal crystals of Mn12 acetate complex [Mn12O12[CH3COO]16[H2O]4], a material composed of a large ~Avogadro’s! number of identical magnetic molecules, each of spin 10. Exchange coupling between Mn ions within each molecule is very strong, while the interaction between molecules is negligible. A large, uniaxial anisotropy ~;60 K! gives rise to a doubly degenerate ground state corresponding to spin projections of 610 along the easy axis ~c axis!; hysteretic behavior is found below a blocking temperature Tb;3 K. Based on measurements of oriented crystallites at temperatures between 1.7 and 3.2 K, we report strong evidence for resonant tunneling of the magnetization: periodic steps in the hysteresis loop, and periodic marked increases in the magnetic relaxation rate at the magnetic fields corresponding to these steps. A total of seven increases in the relaxation rate were found within the temperature range of our experiments with a period of 0.46 T; we suggest that many more such steps would be found at lower temperatures. We attribute these observations to thermally assisted resonant tunneling of the magnetization and propose a detailed model to account for our results.
publishDate 1997
dc.date.none.fl_str_mv 1997
2009
2009
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/10656
url https://hdl.handle.net/2445/10656
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.55.5858
Physical Review B, 1997, vol. 55, núm. 9, p. 5858-5865.
http://dx.doi.org/10.1103/PhysRevB.55.5858
dc.rights.none.fl_str_mv (c) The American Physical Society, 1997
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The American Physical Society, 1997
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 8 p.
application/pdf
dc.publisher.none.fl_str_mv The American Physical Society
publisher.none.fl_str_mv The American Physical Society
dc.source.none.fl_str_mv Articles publicats en revistes (Física de la Matèria Condensada)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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