Origin of Interfacial Magnetic Anisotropy in Ta/CoFeB/MgO and Pt/CoFeB/MgO Multilayer Thin Film Stacks

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dc.authoridAkyol, Mustafa/0000-0001-8584-0620
dc.contributor.authorAkyol, Mustafa
dc.date.accessioned2025-01-06T17:44:02Z
dc.date.available2025-01-06T17:44:02Z
dc.date.issued2019
dc.description.abstractInterfacial perpendicular magnetic anisotropy (PMA) in Pt/Co40Fe40B20/MgO and Ta/Co40Fe40B20/MgO multilayer structures has been researched at various CoFeB layer thicknesses. Magneto-optical Kerr effect (MOKE) and vibrating sample magnetometer (VSM) measurements show that while strong PMA is achieved in Ta/Co40Fe40B20/MgO structure for the thickness of Co40Fe40B20 range from 0.5 to 1.0nm, a very weak PMA is observed in Pt/Co40Fe40B20/MgO film stack for the same Co40Fe40B20 thicknesses. Based on the experimental results, the interfacial anisotropy energy in Ta/Co40Fe40B20/MgO (1.17erg/cm(2)) was found to be almost 2.5x larger than that in Pt/Co40Fe40B20/MgO (0.43erg/cm(2)). It is accepted that the PMA comes from the seed/ferromagnetic and ferromagnetic/oxide layer interfaces. Thus, the origin of interfacial magnetic anisotropy can be hybridization and/or crystallinity properties at the interfaces in Ta- and Pt-seeded stacks. While the PMA is strong in Pt/Co/MgO structure, it becomes in-plane in Fe-rich Pt/CoFeB/MgO structure. It is deduced that hybridization between 3d-5d (Co-Pt) orbitals is more dominant in Pt/CoFeB interface than 2p-3d (O-Fe) hybridization at CoFeB/MgO interface in Pt-seeded stacks. In addition, the crystallinity was studied by performing high-resolution x-ray diffraction (HR-XRD) technique. The crystal orientations of Ta and Pt are found as (002) and (111), respectively. The ferromagnetic layer might be induced out-of-plane orientation in Ta-seeded stack due to observing highly crystallized MgO (001). Thus, another reason for in-plane magnetic anisotropy in Pt/Co40Fe40B20/MgO might be the absence of MgO crystallization because Pt is crystallized fcc (111) orientation.
dc.description.sponsorshipAdana Science and Technology University (Adana/Turkey) [17103024]
dc.description.sponsorshipThis work was partially supported by Adana Science and Technology University (Adana/Turkey) under the project number of 17103024.
dc.identifier.doi10.1007/s10948-019-5005-8
dc.identifier.endpage462
dc.identifier.issn1557-1939
dc.identifier.issn1557-1947
dc.identifier.issue3
dc.identifier.scopus2-s2.0-85060529724
dc.identifier.scopusqualityQ2
dc.identifier.startpage457
dc.identifier.urihttps://doi.org/10.1007/s10948-019-5005-8
dc.identifier.urihttps://hdl.handle.net/20.500.14669/2887
dc.identifier.volume32
dc.identifier.wosWOS:000464761000002
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofJournal of Superconductivity and Novel Magnetism
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectPMA
dc.subjectThin films
dc.subjectMagnetic multilayer stacks
dc.subjectSpintronics
dc.titleOrigin of Interfacial Magnetic Anisotropy in Ta/CoFeB/MgO and Pt/CoFeB/MgO Multilayer Thin Film Stacks
dc.typeArticle

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