Negative differential magnetization for Ni nanoparticles in Al
Autor(a) principal: | |
---|---|
Data de Publicação: | 2005 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/104264 |
Resumo: | Using a layer-by-layer deposition technique, Ni thin films were sandwiched between AlOx layers in an Al matrix. By using x-ray-absorption spectroscopy, grazing incidence small-angle x-ray scattering, and highresolution transmission electron microscopy, we showed that the Ni layers are discontinuous and that pure Ni clusters are formed with sizes in the nanometer range. Depending on the preparation conditions, different magnetic behaviours are observed. When only one discontinuous Ni layer is grown, the hysteresis loops at low temperature display a conventional shape with a reduced magnetic moment per atom due to a magnetically dead layer at the cluster surface. When three discontinuous Ni layers are grown, a negative differential magnetization is observed. This phenomenon is interpreted as due to an antiferromagnetic coupling between two populations of magnetic grains having different average diameters in the different Ni layers. The coupling is indirect through the Al spacer. |
id |
UFRGS-2_06454790833cecb66c76fe3960d89253 |
---|---|
oai_identifier_str |
oai:www.lume.ufrgs.br:10183/104264 |
network_acronym_str |
UFRGS-2 |
network_name_str |
Repositório Institucional da UFRGS |
repository_id_str |
|
spelling |
Fonda, EmilianoTeixeira, Sergio RibeiroGeshev, Julian PenkovBabonneau, DavidPailloux, FredericTraverse, Agnes2014-10-08T02:11:17Z20051098-0121http://hdl.handle.net/10183/104264000484928Using a layer-by-layer deposition technique, Ni thin films were sandwiched between AlOx layers in an Al matrix. By using x-ray-absorption spectroscopy, grazing incidence small-angle x-ray scattering, and highresolution transmission electron microscopy, we showed that the Ni layers are discontinuous and that pure Ni clusters are formed with sizes in the nanometer range. Depending on the preparation conditions, different magnetic behaviours are observed. When only one discontinuous Ni layer is grown, the hysteresis loops at low temperature display a conventional shape with a reduced magnetic moment per atom due to a magnetically dead layer at the cluster surface. When three discontinuous Ni layers are grown, a negative differential magnetization is observed. This phenomenon is interpreted as due to an antiferromagnetic coupling between two populations of magnetic grains having different average diameters in the different Ni layers. The coupling is indirect through the Al spacer.application/pdfengPhysical review. B, Condensed matter and materials physics. Vol. 71, no. 18 (May 2005), 184411 9p.FísicaNegative differential magnetization for Ni nanoparticles in AlEstrangeiroinfo: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:UFRGSORIGINAL000484928.pdf000484928.pdfTexto completo (inglês)application/pdf651789http://www.lume.ufrgs.br/bitstream/10183/104264/1/000484928.pdf5281ff125251b1e1b236d937f06c96c1MD51TEXT000484928.pdf.txt000484928.pdf.txtExtracted Texttext/plain37189http://www.lume.ufrgs.br/bitstream/10183/104264/2/000484928.pdf.txted55a54bcaacb3dd4b80d6dc5a90c9b4MD52THUMBNAIL000484928.pdf.jpg000484928.pdf.jpgGenerated Thumbnailimage/jpeg2015http://www.lume.ufrgs.br/bitstream/10183/104264/3/000484928.pdf.jpg2f15b6ed406101105ce19c8669c44394MD5310183/1042642023-09-20 03:31:37.216647oai:www.lume.ufrgs.br:10183/104264Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-09-20T06:31:37Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Negative differential magnetization for Ni nanoparticles in Al |
title |
Negative differential magnetization for Ni nanoparticles in Al |
spellingShingle |
Negative differential magnetization for Ni nanoparticles in Al Fonda, Emiliano Física |
title_short |
Negative differential magnetization for Ni nanoparticles in Al |
title_full |
Negative differential magnetization for Ni nanoparticles in Al |
title_fullStr |
Negative differential magnetization for Ni nanoparticles in Al |
title_full_unstemmed |
Negative differential magnetization for Ni nanoparticles in Al |
title_sort |
Negative differential magnetization for Ni nanoparticles in Al |
author |
Fonda, Emiliano |
author_facet |
Fonda, Emiliano Teixeira, Sergio Ribeiro Geshev, Julian Penkov Babonneau, David Pailloux, Frederic Traverse, Agnes |
author_role |
author |
author2 |
Teixeira, Sergio Ribeiro Geshev, Julian Penkov Babonneau, David Pailloux, Frederic Traverse, Agnes |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Fonda, Emiliano Teixeira, Sergio Ribeiro Geshev, Julian Penkov Babonneau, David Pailloux, Frederic Traverse, Agnes |
dc.subject.por.fl_str_mv |
Física |
topic |
Física |
description |
Using a layer-by-layer deposition technique, Ni thin films were sandwiched between AlOx layers in an Al matrix. By using x-ray-absorption spectroscopy, grazing incidence small-angle x-ray scattering, and highresolution transmission electron microscopy, we showed that the Ni layers are discontinuous and that pure Ni clusters are formed with sizes in the nanometer range. Depending on the preparation conditions, different magnetic behaviours are observed. When only one discontinuous Ni layer is grown, the hysteresis loops at low temperature display a conventional shape with a reduced magnetic moment per atom due to a magnetically dead layer at the cluster surface. When three discontinuous Ni layers are grown, a negative differential magnetization is observed. This phenomenon is interpreted as due to an antiferromagnetic coupling between two populations of magnetic grains having different average diameters in the different Ni layers. The coupling is indirect through the Al spacer. |
publishDate |
2005 |
dc.date.issued.fl_str_mv |
2005 |
dc.date.accessioned.fl_str_mv |
2014-10-08T02:11:17Z |
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/10183/104264 |
dc.identifier.issn.pt_BR.fl_str_mv |
1098-0121 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000484928 |
identifier_str_mv |
1098-0121 000484928 |
url |
http://hdl.handle.net/10183/104264 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. B, Condensed matter and materials physics. Vol. 71, no. 18 (May 2005), 184411 9p. |
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/10183/104264/1/000484928.pdf http://www.lume.ufrgs.br/bitstream/10183/104264/2/000484928.pdf.txt http://www.lume.ufrgs.br/bitstream/10183/104264/3/000484928.pdf.jpg |
bitstream.checksum.fl_str_mv |
5281ff125251b1e1b236d937f06c96c1 ed55a54bcaacb3dd4b80d6dc5a90c9b4 2f15b6ed406101105ce19c8669c44394 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 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_ |
1798487262913101824 |