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Boundary-induced phase in epitaxial iron layers
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.ORCID iD: 0000-0001-9502-8599
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

We report the discovery of a boundary-induced body-centered tetragonal (bct) iron phase in thin films deposited on MgAl2O4 (001) substrates. We present evidence for this phase using detailed x-ray analysis and ab-initio density functional theory calculations. A lower magnetic moment and a rotation of the easy magnetisation direction are observed, as compared to body-centered cubic (bcc) iron. Our findings expand the range of known crystal and magnetic phases of iron, providing valuable insights for the development of heterostructure devices using ultra-thin iron layers. 

National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-520682OAI: oai:DiVA.org:uu-520682DiVA, id: diva2:1827530
Available from: 2024-01-14 Created: 2024-01-14 Last updated: 2024-01-15
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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Supervisors
Available from: 2024-02-07 Created: 2024-01-15 Last updated: 2024-03-12

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Other links

https://arxiv.org/abs/2401.05990

Authority records

Hjörvarsson, BjörgvinSvedlindh, PeterPálsson, Gunnar K.Kapaklis, Vassilios

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Ravensburg, Anna LenaHjörvarsson, BjörgvinSvedlindh, PeterPálsson, Gunnar K.Kapaklis, Vassilios
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