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Epitaxy enhancement in oxide/tungsten heterostructures by harnessing the interface adhesion
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.ORCID iD: 0000-0001-9502-8599
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science and Engineering. (Myfab Uppsala)ORCID iD: 0000-0002-6043-9248
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
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2024 (English)In: Applied Physics A: Materials Science & Processing, ISSN 0947-8396, E-ISSN 1432-0630, Vol. 130, no 2, article id 74Article in journal (Refereed) Published
Abstract [en]

The conditions whereby epitaxy is achieved are commonly believed to be mostly governed by misfit strain. We report on a systematic investigation of growth and interface structure of single crystalline tungsten thin films on two different metal oxide substrates, Al2O3 (11‾20) and MgO (001). We demonstrate that despite a significant mismatch, enhanced crystal quality is observed for tungsten grown on the sapphire substrates. This is promoted by stronger adhesion and chemical bonding with sapphire compared to magnesium oxide, along with the restructuring of the tungsten layers close to the interface. The latter is supported by ab initio calculations using density functional theory. Finally, we demonstrate the growth of magnetic heterostructures consisting of high-quality tungsten layers in combination with ferromagnetic CoFe layers, which are relevant for spintronic applications.

Place, publisher, year, edition, pages
Springer, 2024. Vol. 130, no 2, article id 74
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-520683DOI: 10.1007/s00339-023-07212-wISI: 001137900100005OAI: oai:DiVA.org:uu-520683DiVA, id: diva2:1827531
Funder
Swedish Research Council, 2019-03581Swedish Research Council, 2021-0465Swedish Energy Agency, 2020-005212Olle Engkvists stiftelse, 217-0023National Academic Infrastructure for Supercomputing in Sweden (NAISS)Swedish Research Council, 2022-06725Available from: 2024-01-14 Created: 2024-01-14 Last updated: 2024-01-31Bibliographically approved
In thesis
1. Order and interfaces in epitaxial heterostructures: Structure and magnetism
Open this publication in new window or tab >>Order and interfaces in epitaxial heterostructures: Structure and magnetism
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The work in this dissertation is devoted to investigating order and interfaces in epitaxial heterostructures. To achieve that the software tool box GenL was developed for simulating and fitting x-ray diffraction patterns from epitaxial thin films, which is used to access structural information on the length scales of interfaces and atomic bonds. Employing GenL, it is shown that a small lattice mismatch between substrate and epitaxial layer is not the sole origin of high crystal quality, as demonstrated for nearly strain-free epitaxial growth of tungsten on sapphire with a lattice mismatch of up to 19.4 %. Furthermore, it is discussed that electronic states at the substrate/film interface can have substantial significance for the crystal structure of an epitaxial layer. For instance, despite a nearly mismatch-free interface of body-centered cubic iron on spinel, the presence of a boundary-induced interface layer with tetragonally distorted crystal structure is discovered, which has a profound impact on the magnetic properties. Finally, when creating multilayered structures, not only the interface states but the total structure is found to influence the physical properties, which is demonstrated for the interlayer exchange coupling in [Fe/MgO]Nsuperlattices.

Note: This PhD thesis is partly based on the licentiate dissertation "Growth of high quality Fe thin films" by Anna L. Ravensburg, Uppsala University, 2022. Particularly parts of: Chapter 1, Sections 2.0, 2.1, 2.2, 3.0, 3.1, 3.2, 3.3, 5.1, and Fig. 2.6 are adapted from the licentiate thesis with minor edits and updates.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2024. p. 106
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 2356
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-520686 (URN)978-91-513-2010-6 (ISBN)
Public defence
2024-03-01, Heinz-Otto Kreiss Föreläsningssal, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:00 (English)
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Available from: 2024-02-07 Created: 2024-01-15 Last updated: 2024-03-12

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Ravensburg, Anna L.Brucas, RimantasSpode, LennartPálsson, Gunnar K.Svedlindh, PeterKapaklis, Vassilios

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Ravensburg, Anna L.Brucas, RimantasSpode, LennartPálsson, Gunnar K.Svedlindh, PeterKapaklis, Vassilios
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