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Influence of misfit strain on the physical properties of Fe thin films
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. (Materials Physics)ORCID iD: 0000-0001-9502-8599
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.ORCID iD: 0000-0001-5997-8597
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.ORCID iD: 0000-0003-1803-9467
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2022 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 761, article id 139494Article in journal (Refereed) Published
Abstract [en]

We investigate the growth of thin Fe layers on MgAl2O4 (001) and MgO (001) substrates using dc magnetron sputtering. The crystal quality of Fe layers deposited on MgAl2O4 is found to be substantially higher as compared to Fe grown on MgO substrates. The effects of the crystal quality on the magnetic and electric transport properties are discussed. 

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 761, article id 139494
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:uu:diva-473435DOI: 10.1016/j.tsf.2022.139494ISI: 000867640600006OAI: oai:DiVA.org:uu-473435DiVA, id: diva2:1654298
Funder
Swedish Research Council, 2019-03581Swedish Research Council, 2019-05379Swedish Energy Agency, 2020-005212Available from: 2022-04-26 Created: 2022-04-26 Last updated: 2024-04-22Bibliographically approved
In thesis
1. Growth of high quality Fe thin films: A study of the effect of mismatch strain on the physical properties of Fe
Open this publication in new window or tab >>Growth of high quality Fe thin films: A study of the effect of mismatch strain on the physical properties of Fe
2022 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The work in this licentiate is devoted to investigating the epitaxial growth of thin Fe layers on MgAl2O4 (001) and MgO (001) substrates using dc magnetron sputtering. The aim is to qualitatively and quantitatively determine the crystal quality of the grown Fe layers depending on their thickness, substrate material, and selected deposition parameters. The effect of the crystal quality on the magnetic and electronic transport properties is discussed. The structural characterization of the epitaxial Fe thin films is carried out by x-ray reflectometry and diffraction as well as transmission electron microscopy. X-ray scattering measurements and analysis with related models allow for a quantitative determination of layering, crystal quality, and strain profiles in the growing Fe. Magnetic properties are determined using a combination of longitudinal magneto-optical Kerr effect measurements, Kerr microscopy, and scanning electron microscopy with polarization analyser. Electronic transport properties are characterized by four-point probe measurements of the thin films. The epitaxial growth of Fe is found to be highly substrate dependent: Fe layers grown on MgAl2O4 have a significantly higher crystal quality, as compared to Fe grown on MgO. The difference in crystal quality is attributed to different strain states in Fe, which is supported by theoretical calculations of the critical thickness on both substrates. Moreover, an anomalous elastic response in Fe at the thin film limit is found. The magnetic properties of Fe are weakly reflecting the differences in crystal quality of the Fe layers. However, the difference in crystal quality affects the electronic transport properties. The results of this study on epitaxial Fe layers can provide insights into strain and defect engineering in Fe thin films, which can additionally serve as model systems for finite size effects.

Place, publisher, year, edition, pages
Uppsala: Department of Physics and Astronomy, 2022. p. 63
Keywords
thin film growth, crystal quality, strain, magnetism, electronic transport
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-473436 (URN)
Presentation
2022-06-14, Room Å90101, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2022-05-12 Created: 2022-04-26 Last updated: 2022-05-12Bibliographically approved
2. 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)
Opponent
Supervisors
Available from: 2024-02-07 Created: 2024-01-15 Last updated: 2024-03-12

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Publisher's full textarXiv:2204.02286

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Ravensburg, Anna L.Pálsson, Gunnar K.Pohlit, MerlinHjörvarsson, BjörgvinKapaklis, Vassilios

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