Angular and temperature dependence of the magnetic circular dichroism in 4d core-level photoemission from Gd(0001)
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/103931 |
Resumo: | We present experimental and theoretical results for the angular and temperature dependence of magnetic circular dichroism in Gd 4d core-level photoelectron emission from a Gd(0001) surface in both normal and off-normal directions and with azimuthal variation. Two theoretical approaches are used to model this data: a single electron theory with full multiple scattering of the outgoing photoelectron and a full-relativistic manyelectron theory with single scattering only. Thermal effects due to atomic vibrations and the excitation of initial-state multiplets are also included. For normal emission, we find smooth free-atom-like angular variations in emission intensity, while for off-normal emission, deviations from a purely atomic model due to photoelectron diffraction effects are seen that are well predicted by photoelectron diffraction theory. We also compare dichroism measurements using two different approaches (fixed magnetization with variable light helicity and fixed light helicity with rotated sample magnetization) and find significant differences between them that are also well predicted by theory. The angular dependence of magnetic circular dichroism for a specific set of Gd 4d multiplet states has also been measured with high electron energy resolution (≤100 meV), permitting a state-specific decomposition of the dichroism. Such state-resolved dichroism is found to be very well described by our many-electron approach. Finally, we present temperature-dependent magnetic circular dichroism (MCD) data for 4d emission that should permit the study of near-surface magnetic phase transitions, and discuss the relationship of such MCD measurements to magnetization. Some future prospects and applications of such core-photoemission dichroism measurements are discussed. |
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Denecke, ReinhardMorais, JonderYnzunza, Ramon X.Fecher, Gerhard H.Menchero, Jose G.Liesegang, JohnKortright, Jeff B.Hussain, ZahidFadley, Charles S.2014-09-30T02:12:36Z20021098-0121http://hdl.handle.net/10183/103931000329967We present experimental and theoretical results for the angular and temperature dependence of magnetic circular dichroism in Gd 4d core-level photoelectron emission from a Gd(0001) surface in both normal and off-normal directions and with azimuthal variation. Two theoretical approaches are used to model this data: a single electron theory with full multiple scattering of the outgoing photoelectron and a full-relativistic manyelectron theory with single scattering only. Thermal effects due to atomic vibrations and the excitation of initial-state multiplets are also included. For normal emission, we find smooth free-atom-like angular variations in emission intensity, while for off-normal emission, deviations from a purely atomic model due to photoelectron diffraction effects are seen that are well predicted by photoelectron diffraction theory. We also compare dichroism measurements using two different approaches (fixed magnetization with variable light helicity and fixed light helicity with rotated sample magnetization) and find significant differences between them that are also well predicted by theory. The angular dependence of magnetic circular dichroism for a specific set of Gd 4d multiplet states has also been measured with high electron energy resolution (≤100 meV), permitting a state-specific decomposition of the dichroism. Such state-resolved dichroism is found to be very well described by our many-electron approach. Finally, we present temperature-dependent magnetic circular dichroism (MCD) data for 4d emission that should permit the study of near-surface magnetic phase transitions, and discuss the relationship of such MCD measurements to magnetization. Some future prospects and applications of such core-photoemission dichroism measurements are discussed.application/pdfengPhysical review. B, Condensed matter and materials physics. Melville. Vol. 65, no. 24 (June 2002), 245421, 18 p.Difração de elétronsGadolínioDicroismo circular magnéticoTransições magnéticasMagnetizaçãoTeoria de espalhamento relativisticoIntensidade de linha espectralMagnetismo de superficiesEspectro de fotoeletrons produzidos por raios-xAngular and temperature dependence of the magnetic circular dichroism in 4d core-level photoemission from Gd(0001)Estrangeiroinfo: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:UFRGSORIGINAL000329967.pdf000329967.pdfTexto completo (inglês)application/pdf285423http://www.lume.ufrgs.br/bitstream/10183/103931/1/000329967.pdf0b170210e02cd97fa97d68387b194574MD51TEXT000329967.pdf.txt000329967.pdf.txtExtracted Texttext/plain93240http://www.lume.ufrgs.br/bitstream/10183/103931/2/000329967.pdf.txtef0f56ffa07cde317975e0df4ee1149eMD52THUMBNAIL000329967.pdf.jpg000329967.pdf.jpgGenerated Thumbnailimage/jpeg1856http://www.lume.ufrgs.br/bitstream/10183/103931/3/000329967.pdf.jpga7611b6ffac981770212b75d1be08923MD5310183/1039312023-07-19 03:40:28.286086oai:www.lume.ufrgs.br:10183/103931Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-19T06:40:28Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Angular and temperature dependence of the magnetic circular dichroism in 4d core-level photoemission from Gd(0001) |
title |
Angular and temperature dependence of the magnetic circular dichroism in 4d core-level photoemission from Gd(0001) |
spellingShingle |
Angular and temperature dependence of the magnetic circular dichroism in 4d core-level photoemission from Gd(0001) Denecke, Reinhard Difração de elétrons Gadolínio Dicroismo circular magnético Transições magnéticas Magnetização Teoria de espalhamento relativistico Intensidade de linha espectral Magnetismo de superficies Espectro de fotoeletrons produzidos por raios-x |
title_short |
Angular and temperature dependence of the magnetic circular dichroism in 4d core-level photoemission from Gd(0001) |
title_full |
Angular and temperature dependence of the magnetic circular dichroism in 4d core-level photoemission from Gd(0001) |
title_fullStr |
Angular and temperature dependence of the magnetic circular dichroism in 4d core-level photoemission from Gd(0001) |
title_full_unstemmed |
Angular and temperature dependence of the magnetic circular dichroism in 4d core-level photoemission from Gd(0001) |
title_sort |
Angular and temperature dependence of the magnetic circular dichroism in 4d core-level photoemission from Gd(0001) |
author |
Denecke, Reinhard |
author_facet |
Denecke, Reinhard Morais, Jonder Ynzunza, Ramon X. Fecher, Gerhard H. Menchero, Jose G. Liesegang, John Kortright, Jeff B. Hussain, Zahid Fadley, Charles S. |
author_role |
author |
author2 |
Morais, Jonder Ynzunza, Ramon X. Fecher, Gerhard H. Menchero, Jose G. Liesegang, John Kortright, Jeff B. Hussain, Zahid Fadley, Charles S. |
author2_role |
author author author author author author author author |
dc.contributor.author.fl_str_mv |
Denecke, Reinhard Morais, Jonder Ynzunza, Ramon X. Fecher, Gerhard H. Menchero, Jose G. Liesegang, John Kortright, Jeff B. Hussain, Zahid Fadley, Charles S. |
dc.subject.por.fl_str_mv |
Difração de elétrons Gadolínio Dicroismo circular magnético Transições magnéticas Magnetização Teoria de espalhamento relativistico Intensidade de linha espectral Magnetismo de superficies Espectro de fotoeletrons produzidos por raios-x |
topic |
Difração de elétrons Gadolínio Dicroismo circular magnético Transições magnéticas Magnetização Teoria de espalhamento relativistico Intensidade de linha espectral Magnetismo de superficies Espectro de fotoeletrons produzidos por raios-x |
description |
We present experimental and theoretical results for the angular and temperature dependence of magnetic circular dichroism in Gd 4d core-level photoelectron emission from a Gd(0001) surface in both normal and off-normal directions and with azimuthal variation. Two theoretical approaches are used to model this data: a single electron theory with full multiple scattering of the outgoing photoelectron and a full-relativistic manyelectron theory with single scattering only. Thermal effects due to atomic vibrations and the excitation of initial-state multiplets are also included. For normal emission, we find smooth free-atom-like angular variations in emission intensity, while for off-normal emission, deviations from a purely atomic model due to photoelectron diffraction effects are seen that are well predicted by photoelectron diffraction theory. We also compare dichroism measurements using two different approaches (fixed magnetization with variable light helicity and fixed light helicity with rotated sample magnetization) and find significant differences between them that are also well predicted by theory. The angular dependence of magnetic circular dichroism for a specific set of Gd 4d multiplet states has also been measured with high electron energy resolution (≤100 meV), permitting a state-specific decomposition of the dichroism. Such state-resolved dichroism is found to be very well described by our many-electron approach. Finally, we present temperature-dependent magnetic circular dichroism (MCD) data for 4d emission that should permit the study of near-surface magnetic phase transitions, and discuss the relationship of such MCD measurements to magnetization. Some future prospects and applications of such core-photoemission dichroism measurements are discussed. |
publishDate |
2002 |
dc.date.issued.fl_str_mv |
2002 |
dc.date.accessioned.fl_str_mv |
2014-09-30T02:12:36Z |
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/10183/103931 |
dc.identifier.issn.pt_BR.fl_str_mv |
1098-0121 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000329967 |
identifier_str_mv |
1098-0121 000329967 |
url |
http://hdl.handle.net/10183/103931 |
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. Melville. Vol. 65, no. 24 (June 2002), 245421, 18 p. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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