Magnetic behavior of Fe:Al₂O₃ nanocomposite films produced by pulsed laser deposition

7 pags. ; 7 figs. ; 1 tab.

Detalles Bibliográficos
Autores: Dempsey, N. M., Ranno, L., Givord, D., Gonzalo de los Reyes, J., Serna, Rosalía, Fei, G. T., Petford-Long, Amanda K., Doole, R. C., Hole, D.E.
Tipo de recurso: artículo
Fecha de publicación:2001
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/46152
Acceso en línea:http://hdl.handle.net/10261/46152
Access Level:acceso abierto
Palabra clave:[PACS] Magnetic properties of monolayers and thin films
[PACS] Fine-particle systems
nanocrystalline materials
[PACS] Nanocrystalline materials
[PACS] Pulsed laser ablation deposition
[PACS] Structure of nanoscale materials
[PACS] Magnetic anisotropy
[PACS] Magnetization curves, hysteresis, Barkhausen and related effects
[PACS] Surface magnetism
[PACS] Other ferromagnetic metals and alloys
[PACS] Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
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spelling Magnetic behavior of Fe:Al₂O₃ nanocomposite films produced by pulsed laser depositionDempsey, N. M.Ranno, L.Givord, D.Gonzalo de los Reyes, J.Serna, RosalíaFei, G. T.Petford-Long, Amanda K.Doole, R. C.Hole, D.E.[PACS] Magnetic properties of monolayers and thin films[PACS] Fine-particle systemsnanocrystalline materials[PACS] Nanocrystalline materials[PACS] Pulsed laser ablation deposition[PACS] Structure of nanoscale materials[PACS] Magnetic anisotropy[PACS] Magnetization curves, hysteresis, Barkhausen and related effects[PACS] Surface magnetism[PACS] Other ferromagnetic metals and alloys[PACS] Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)7 pags. ; 7 figs. ; 1 tab.Structured nanocomposite films consisting of five Fe layers embedded in an amorphous Al2O3 matrix (Fe:Al₂O₃) have been grown by sequential pulsed laser deposition. The formation of well isolated quasispherical nanocrystals is observed for samples with Fe content per layer close to 6.5×10¹⁵ atoms/cm². Increasing the Fe content leads first to the formation of elongated nanocrystals and then to quasicontinuous layers. The evolution in the shape and size of the nanocrystals is reflected in the magnetic behavior of these systems. A crossover from a low temperature ferromagnetic regime to a high temperature superparamagnetic regime is observed at a temperature of 23 K in the samples containing isolated quasi-spherical nanocrystals. In this case, a reduced moment per Fe atom (1.4 μβ/atom) with respect to the value for α-Fe (2.2 μβ/atom) is estimated. This behavior is attributed to the presence of a Fe-oxide surface shell on the nanocrystals. The large values of the estimated effective magnetic anisotropy (1.4×10⁶ J/m³) and the low temperature coercivity in these samples are attributed to a strong surface contribution to anisotropy, whereas the temperature dependence of coercivity is attributed to thermal activation.This work has been partially supported by the European Union (BRITE Project No. 98-0616) and the Spanish CICYT~TIC Project No. 99-0866. One of the authors (N. M. D.) had a Marie Curie fellowship from the European Union. The authors acknowledge the support of the French and Spanish governments (HF1998-0055) and the British Council-Spanish government (HB1998-0182) Integrated Actions scheme for travel.Peer reviewedAmerican Institute of Physics201220122001info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/46152reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1063/1.1415054info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/461522026-05-22T06:33:51Z
dc.title.none.fl_str_mv Magnetic behavior of Fe:Al₂O₃ nanocomposite films produced by pulsed laser deposition
title Magnetic behavior of Fe:Al₂O₃ nanocomposite films produced by pulsed laser deposition
spellingShingle Magnetic behavior of Fe:Al₂O₃ nanocomposite films produced by pulsed laser deposition
Dempsey, N. M.
[PACS] Magnetic properties of monolayers and thin films
[PACS] Fine-particle systems
nanocrystalline materials
[PACS] Nanocrystalline materials
[PACS] Pulsed laser ablation deposition
[PACS] Structure of nanoscale materials
[PACS] Magnetic anisotropy
[PACS] Magnetization curves, hysteresis, Barkhausen and related effects
[PACS] Surface magnetism
[PACS] Other ferromagnetic metals and alloys
[PACS] Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
title_short Magnetic behavior of Fe:Al₂O₃ nanocomposite films produced by pulsed laser deposition
title_full Magnetic behavior of Fe:Al₂O₃ nanocomposite films produced by pulsed laser deposition
title_fullStr Magnetic behavior of Fe:Al₂O₃ nanocomposite films produced by pulsed laser deposition
title_full_unstemmed Magnetic behavior of Fe:Al₂O₃ nanocomposite films produced by pulsed laser deposition
title_sort Magnetic behavior of Fe:Al₂O₃ nanocomposite films produced by pulsed laser deposition
dc.creator.none.fl_str_mv Dempsey, N. M.
Ranno, L.
Givord, D.
Gonzalo de los Reyes, J.
Serna, Rosalía
Fei, G. T.
Petford-Long, Amanda K.
Doole, R. C.
Hole, D.E.
author Dempsey, N. M.
author_facet Dempsey, N. M.
Ranno, L.
Givord, D.
Gonzalo de los Reyes, J.
Serna, Rosalía
Fei, G. T.
Petford-Long, Amanda K.
Doole, R. C.
Hole, D.E.
author_role author
author2 Ranno, L.
Givord, D.
Gonzalo de los Reyes, J.
Serna, Rosalía
Fei, G. T.
Petford-Long, Amanda K.
Doole, R. C.
Hole, D.E.
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv [PACS] Magnetic properties of monolayers and thin films
[PACS] Fine-particle systems
nanocrystalline materials
[PACS] Nanocrystalline materials
[PACS] Pulsed laser ablation deposition
[PACS] Structure of nanoscale materials
[PACS] Magnetic anisotropy
[PACS] Magnetization curves, hysteresis, Barkhausen and related effects
[PACS] Surface magnetism
[PACS] Other ferromagnetic metals and alloys
[PACS] Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
topic [PACS] Magnetic properties of monolayers and thin films
[PACS] Fine-particle systems
nanocrystalline materials
[PACS] Nanocrystalline materials
[PACS] Pulsed laser ablation deposition
[PACS] Structure of nanoscale materials
[PACS] Magnetic anisotropy
[PACS] Magnetization curves, hysteresis, Barkhausen and related effects
[PACS] Surface magnetism
[PACS] Other ferromagnetic metals and alloys
[PACS] Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
description 7 pags. ; 7 figs. ; 1 tab.
publishDate 2001
dc.date.none.fl_str_mv 2001
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/46152
url http://hdl.handle.net/10261/46152
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1063/1.1415054
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Institute of Physics
publisher.none.fl_str_mv American Institute of Physics
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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