Large Perpendicular Magnetic Anisotropy in Nanometer-Thick Epitaxial Graphene/Co/Heavy Metal Heterostructures for Spin-Orbitronics Devices
Nanometer-thick epitaxial Co films intercalated between graphene (Gr) and a heavy metal (HM) substrate are promising systems for the development of spin-orbitronic devices due to their large perpendicular magnetic anisotropy (PMA). A combination of theoretical modeling and experiments reveals the or...
| Autores: | , , , , , , , , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad del País Vasco |
| Repositorio: | Addi. Archivo Digital para la Docencia y la Investigación |
| OAI Identifier: | oai:addi.ehu.eus:10810/52507 |
| Acceso en línea: | http://hdl.handle.net/10810/52507 |
| Access Level: | acceso abierto |
| Palabra clave: | magnetic multilayers perpendicular magnetic anisotropy spin-orbit coupling MOKE XMCD DFT plane-wave method magnetocrystalline anisotropy circular-dichroism microscopic origin stacking-faults cobalt energy films surfaces growth |
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| dc.title.none.fl_str_mv |
Large Perpendicular Magnetic Anisotropy in Nanometer-Thick Epitaxial Graphene/Co/Heavy Metal Heterostructures for Spin-Orbitronics Devices |
| title |
Large Perpendicular Magnetic Anisotropy in Nanometer-Thick Epitaxial Graphene/Co/Heavy Metal Heterostructures for Spin-Orbitronics Devices |
| spellingShingle |
Large Perpendicular Magnetic Anisotropy in Nanometer-Thick Epitaxial Graphene/Co/Heavy Metal Heterostructures for Spin-Orbitronics Devices Blanco Rey, María magnetic multilayers perpendicular magnetic anisotropy spin-orbit coupling MOKE XMCD DFT plane-wave method magnetocrystalline anisotropy circular-dichroism microscopic origin stacking-faults cobalt energy films surfaces growth |
| title_short |
Large Perpendicular Magnetic Anisotropy in Nanometer-Thick Epitaxial Graphene/Co/Heavy Metal Heterostructures for Spin-Orbitronics Devices |
| title_full |
Large Perpendicular Magnetic Anisotropy in Nanometer-Thick Epitaxial Graphene/Co/Heavy Metal Heterostructures for Spin-Orbitronics Devices |
| title_fullStr |
Large Perpendicular Magnetic Anisotropy in Nanometer-Thick Epitaxial Graphene/Co/Heavy Metal Heterostructures for Spin-Orbitronics Devices |
| title_full_unstemmed |
Large Perpendicular Magnetic Anisotropy in Nanometer-Thick Epitaxial Graphene/Co/Heavy Metal Heterostructures for Spin-Orbitronics Devices |
| title_sort |
Large Perpendicular Magnetic Anisotropy in Nanometer-Thick Epitaxial Graphene/Co/Heavy Metal Heterostructures for Spin-Orbitronics Devices |
| dc.creator.none.fl_str_mv |
Blanco Rey, María Perna, Paolo Gudín, Adrián Díez, José Manuel Anadón, Alberto Olleros Rodríguez, Pablo De Melo Costa, Leticia Valvidares, Manuel Gargiani, Pierluigi Guedeja Marrón, Alejandra Cabero, Mariona Varela, María García Fernández, Carlos Otrokov, Mikhail M. Camarero, Julio Miranda, Rodolfo Arnau Pino, Andrés Cerdá, Jorge I. |
| author |
Blanco Rey, María |
| author_facet |
Blanco Rey, María Perna, Paolo Gudín, Adrián Díez, José Manuel Anadón, Alberto Olleros Rodríguez, Pablo De Melo Costa, Leticia Valvidares, Manuel Gargiani, Pierluigi Guedeja Marrón, Alejandra Cabero, Mariona Varela, María García Fernández, Carlos Otrokov, Mikhail M. Camarero, Julio Miranda, Rodolfo Arnau Pino, Andrés Cerdá, Jorge I. |
| author_role |
author |
| author2 |
Perna, Paolo Gudín, Adrián Díez, José Manuel Anadón, Alberto Olleros Rodríguez, Pablo De Melo Costa, Leticia Valvidares, Manuel Gargiani, Pierluigi Guedeja Marrón, Alejandra Cabero, Mariona Varela, María García Fernández, Carlos Otrokov, Mikhail M. Camarero, Julio Miranda, Rodolfo Arnau Pino, Andrés Cerdá, Jorge I. |
| author2_role |
author author author author author author author author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
magnetic multilayers perpendicular magnetic anisotropy spin-orbit coupling MOKE XMCD DFT plane-wave method magnetocrystalline anisotropy circular-dichroism microscopic origin stacking-faults cobalt energy films surfaces growth |
| topic |
magnetic multilayers perpendicular magnetic anisotropy spin-orbit coupling MOKE XMCD DFT plane-wave method magnetocrystalline anisotropy circular-dichroism microscopic origin stacking-faults cobalt energy films surfaces growth |
| description |
Nanometer-thick epitaxial Co films intercalated between graphene (Gr) and a heavy metal (HM) substrate are promising systems for the development of spin-orbitronic devices due to their large perpendicular magnetic anisotropy (PMA). A combination of theoretical modeling and experiments reveals the origin of the PMA and explains its behavior as a function of the Co thickness. High quality epitaxial Gr/Co-n/HM(111) (HM = Pt,Ir) heterostructures are grown by intercalation below graphene, which acts as a surfactant that kinetically stabilizes the pseudomorphic growth of highly perfect Co face-centered tetragonal (fct) films, with a reduced number of stacking faults as the only structural defect observable by high-resolution scanning transmission electron microscopy (STEM). Magneto-optic Kerr effect (MOKE) measurements show that such heterostructures present PMA up to large Co critical thicknesses of about 4 nm (20 ML) and 2 nm (10 ML) for Pt and Ir substrates, respectively. X-ray magnetic circular dichroism (XMCD) measurements show an inverse power law of the anisotropy of the orbital moment with Co thickness, reflecting its interfacial nature, that changes sign at about the same critical values. First principles calculations show that, regardless of the presence of graphene, ideal Co fct films on HM buffers do not sustain PMAs beyond around 6 mLs due to the in-plane contribution of the inner bulk-like Co layers. The large experimental critical thicknesses sustaining PMA can only be retrieved by the inclusion of structural defects that promote a local hcp stacking such as twin boundaries or stacking faults. Remarkably, a layer resolved analysis of the orbital momentum anisotropy reproduces its interfacial nature, and reveals that the Gr/Co interface contribution is comparable to that of the Co/Pt(Ir). |
| publishDate |
2021 |
| dc.date.none.fl_str_mv |
2021 2021 2021 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10810/52507 |
| url |
http://hdl.handle.net/10810/52507 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
info:eu-repo/grantAgreement/MINECO/RTI2018-097895-B-C41/ info:eu-repo/grantAgreement/MINECO/RTI2018-097895-BC42/ info:eu-repo/grantAgreement/MINECO/RTI2018-097895-B-C43/ info:eu-repo/grantAgreement/MICINN/PID2019-103910GB-I00/ info:eu-repo/grantAgreement/MICINN/FIS2016-78591-C3-1-R/ info:eu-repo/grantAgreement/MICINN/FIS2016-78591C3-2-R/ info:eu-repo/grantAgreement/MICINN/PGC2018-098613-B-C21/ info:eu-repo/grantAgreement/MICINN/PCI2019-111908-2/ info:eu-repo/grantAgreement/MICINN/PCI2019-111867-2/ info:eu-repo/grantAgreement/MINECO/SEV-2016-0686/ https://pubs-acs-org.ehu.idm.oclc.org/doi/10.1021/acsanm.0c03364# |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Atribución-NoComercial-SinDerivadas 3.0 España |
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openAccess |
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http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Atribución-NoComercial-SinDerivadas 3.0 España |
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application/pdf |
| dc.publisher.none.fl_str_mv |
American Chemical Society |
| publisher.none.fl_str_mv |
American Chemical Society |
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reponame:Addi. Archivo Digital para la Docencia y la Investigación instname:Universidad del País Vasco |
| instname_str |
Universidad del País Vasco |
| reponame_str |
Addi. Archivo Digital para la Docencia y la Investigación |
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Addi. Archivo Digital para la Docencia y la Investigación |
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1869420228768694272 |
| spelling |
Large Perpendicular Magnetic Anisotropy in Nanometer-Thick Epitaxial Graphene/Co/Heavy Metal Heterostructures for Spin-Orbitronics DevicesBlanco Rey, MaríaPerna, PaoloGudín, AdriánDíez, José ManuelAnadón, AlbertoOlleros Rodríguez, PabloDe Melo Costa, LeticiaValvidares, ManuelGargiani, PierluigiGuedeja Marrón, AlejandraCabero, MarionaVarela, MaríaGarcía Fernández, CarlosOtrokov, Mikhail M.Camarero, JulioMiranda, RodolfoArnau Pino, AndrésCerdá, Jorge I.magnetic multilayersperpendicular magnetic anisotropyspin-orbit couplingMOKEXMCDDFTplane-wave methodmagnetocrystalline anisotropycircular-dichroismmicroscopic originstacking-faultscobaltenergyfilmssurfacesgrowthNanometer-thick epitaxial Co films intercalated between graphene (Gr) and a heavy metal (HM) substrate are promising systems for the development of spin-orbitronic devices due to their large perpendicular magnetic anisotropy (PMA). A combination of theoretical modeling and experiments reveals the origin of the PMA and explains its behavior as a function of the Co thickness. High quality epitaxial Gr/Co-n/HM(111) (HM = Pt,Ir) heterostructures are grown by intercalation below graphene, which acts as a surfactant that kinetically stabilizes the pseudomorphic growth of highly perfect Co face-centered tetragonal (fct) films, with a reduced number of stacking faults as the only structural defect observable by high-resolution scanning transmission electron microscopy (STEM). Magneto-optic Kerr effect (MOKE) measurements show that such heterostructures present PMA up to large Co critical thicknesses of about 4 nm (20 ML) and 2 nm (10 ML) for Pt and Ir substrates, respectively. X-ray magnetic circular dichroism (XMCD) measurements show an inverse power law of the anisotropy of the orbital moment with Co thickness, reflecting its interfacial nature, that changes sign at about the same critical values. First principles calculations show that, regardless of the presence of graphene, ideal Co fct films on HM buffers do not sustain PMAs beyond around 6 mLs due to the in-plane contribution of the inner bulk-like Co layers. The large experimental critical thicknesses sustaining PMA can only be retrieved by the inclusion of structural defects that promote a local hcp stacking such as twin boundaries or stacking faults. Remarkably, a layer resolved analysis of the orbital momentum anisotropy reproduces its interfacial nature, and reveals that the Gr/Co interface contribution is comparable to that of the Co/Pt(Ir).Financial support from MINECO (Grant Nos. RTI2018-097895-B-C41, RTI2018-097895-BC42 and RTI2018-097895-B-C43 (FUN-SOC), PID2019- 103910GB-I00, FIS2016-78591-C3-1-R and FIS2016-78591- C3-2-R (SKYTRON), PGC2018-098613-B-C21 (SpOrQuMat), PCI2019-111908-2 and PCI2019-111867-2 (FLAGERA 3 grant SOgraphMEM)], from Regional Government of Madrid (grant number P2018/NMT-4321 (NANOMAGCOST-CM)) and from Gobierno Vasco-UPV/EHU (grant numbers GIU18/138 and IT-1246-19). We acknowledge experiments at ALBA BL29 via proposal no. 2019023333. IMDEA-Nanociencia acknowledges support from the “Severo Ochoa” Program for Centres of Excellence in R&D (MINECO, Grant SEV-2016-0686)American Chemical Society202120212021info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/52507reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoInglésinfo:eu-repo/grantAgreement/MINECO/RTI2018-097895-B-C41/info:eu-repo/grantAgreement/MINECO/RTI2018-097895-BC42/info:eu-repo/grantAgreement/MINECO/RTI2018-097895-B-C43/info:eu-repo/grantAgreement/MICINN/PID2019-103910GB-I00/info:eu-repo/grantAgreement/MICINN/FIS2016-78591-C3-1-R/info:eu-repo/grantAgreement/MICINN/FIS2016-78591C3-2-R/info:eu-repo/grantAgreement/MICINN/PGC2018-098613-B-C21/info:eu-repo/grantAgreement/MICINN/PCI2019-111908-2/info:eu-repo/grantAgreement/MICINN/PCI2019-111867-2/info:eu-repo/grantAgreement/MINECO/SEV-2016-0686/https://pubs-acs-org.ehu.idm.oclc.org/doi/10.1021/acsanm.0c03364#info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/3.0/es/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY-NC-ND 4.0)Atribución-NoComercial-SinDerivadas 3.0 Españaoai:addi.ehu.eus:10810/525072026-06-18T09:23:17Z |
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