Phenomenological study of the amorphous Fe80B20 ferromagnet with small random anisotropy

The magnetic behavior of some amorphous ferromagnets of composition Fe 80 − x R x B 20 (R being a rare-earth element) is investigated as a function of the external applied magnetic field and temperature using dc magnetic measurements. Random magnetic anisotropy is generated by dilution of rare-earth...

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Autores: Tejada Palacios, Javier, Martínez Benjamin, Joan Josep, Labarta, Amílcar, Grössinger, R., Sassik, H., Vázquez, M., Hernando, Antonio, 1947-
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1990
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/9766
Acceso en línea:https://hdl.handle.net/2445/9766
Access Level:acceso abierto
Palabra clave:Substàncies amorfes
Propietats magnètiques
Amorphous substances
Magnetic properties
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spelling Phenomenological study of the amorphous Fe80B20 ferromagnet with small random anisotropyTejada Palacios, JavierMartínez Benjamin, Joan JosepLabarta, AmílcarGrössinger, R.Sassik, H.Vázquez, M.Hernando, Antonio, 1947-Substàncies amorfesPropietats magnètiquesAmorphous substancesMagnetic propertiesThe magnetic behavior of some amorphous ferromagnets of composition Fe 80 − x R x B 20 (R being a rare-earth element) is investigated as a function of the external applied magnetic field and temperature using dc magnetic measurements. Random magnetic anisotropy is generated by dilution of rare-earth atoms in the Fe 80 B 20 ferromagnetic matrix. Hysteresis curves show a quasireversible behavior with very small coercivity and remanence, suggesting a weak random magnetic anisotropy. In the high-applied-field regime the samples show ferromagnetic saturation, and from the M values it is possible to conclude that the light rare-earth atoms (Ce, Nd) are ferromagnetically coupled with the iron atoms, whereas the heavy atoms (Gd, Dy) couple ferrimagnetically to the Fe moments. The temperature dependence of the magnetization has also been studied in the conventional spin-wave framework, and the values obtained for the spin-wave stiffness constant D are close to 100 meV A ˚ 2 , which is typical for this kind of material. In the low-applied-field and low-temperature regime a much more complex behavior is observed as a consequence of the competition between local random anisotropy and exchange interactions. The different dependence on T of the correlation length associated to the local random anisotropy and to the exchange interactions makes possible the existence of different magnetic orderings, but no phase transition is observed between them.The American Physical Society1990info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/9766Articles publicats en revistes (Física de la Matèria Condensada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.42.898Physical Review B, 1990, vol. 42, núm. 1, p. 898-905.http://dx.doi.org/10.1103/PhysRevB.42.898(c) The American Physical Society, 1990info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/97662026-05-27T06:46:51Z
dc.title.none.fl_str_mv Phenomenological study of the amorphous Fe80B20 ferromagnet with small random anisotropy
title Phenomenological study of the amorphous Fe80B20 ferromagnet with small random anisotropy
spellingShingle Phenomenological study of the amorphous Fe80B20 ferromagnet with small random anisotropy
Tejada Palacios, Javier
Substàncies amorfes
Propietats magnètiques
Amorphous substances
Magnetic properties
title_short Phenomenological study of the amorphous Fe80B20 ferromagnet with small random anisotropy
title_full Phenomenological study of the amorphous Fe80B20 ferromagnet with small random anisotropy
title_fullStr Phenomenological study of the amorphous Fe80B20 ferromagnet with small random anisotropy
title_full_unstemmed Phenomenological study of the amorphous Fe80B20 ferromagnet with small random anisotropy
title_sort Phenomenological study of the amorphous Fe80B20 ferromagnet with small random anisotropy
dc.creator.none.fl_str_mv Tejada Palacios, Javier
Martínez Benjamin, Joan Josep
Labarta, Amílcar
Grössinger, R.
Sassik, H.
Vázquez, M.
Hernando, Antonio, 1947-
author Tejada Palacios, Javier
author_facet Tejada Palacios, Javier
Martínez Benjamin, Joan Josep
Labarta, Amílcar
Grössinger, R.
Sassik, H.
Vázquez, M.
Hernando, Antonio, 1947-
author_role author
author2 Martínez Benjamin, Joan Josep
Labarta, Amílcar
Grössinger, R.
Sassik, H.
Vázquez, M.
Hernando, Antonio, 1947-
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Substàncies amorfes
Propietats magnètiques
Amorphous substances
Magnetic properties
topic Substàncies amorfes
Propietats magnètiques
Amorphous substances
Magnetic properties
description The magnetic behavior of some amorphous ferromagnets of composition Fe 80 − x R x B 20 (R being a rare-earth element) is investigated as a function of the external applied magnetic field and temperature using dc magnetic measurements. Random magnetic anisotropy is generated by dilution of rare-earth atoms in the Fe 80 B 20 ferromagnetic matrix. Hysteresis curves show a quasireversible behavior with very small coercivity and remanence, suggesting a weak random magnetic anisotropy. In the high-applied-field regime the samples show ferromagnetic saturation, and from the M values it is possible to conclude that the light rare-earth atoms (Ce, Nd) are ferromagnetically coupled with the iron atoms, whereas the heavy atoms (Gd, Dy) couple ferrimagnetically to the Fe moments. The temperature dependence of the magnetization has also been studied in the conventional spin-wave framework, and the values obtained for the spin-wave stiffness constant D are close to 100 meV A ˚ 2 , which is typical for this kind of material. In the low-applied-field and low-temperature regime a much more complex behavior is observed as a consequence of the competition between local random anisotropy and exchange interactions. The different dependence on T of the correlation length associated to the local random anisotropy and to the exchange interactions makes possible the existence of different magnetic orderings, but no phase transition is observed between them.
publishDate 1990
dc.date.none.fl_str_mv 1990
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/2445/9766
url https://hdl.handle.net/2445/9766
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.42.898
Physical Review B, 1990, vol. 42, núm. 1, p. 898-905.
http://dx.doi.org/10.1103/PhysRevB.42.898
dc.rights.none.fl_str_mv (c) The American Physical Society, 1990
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The American Physical Society, 1990
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 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:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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