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Resistivity changes in Cr/V(0 0 1) superlattices during hydrogen absorption
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
2007 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, Vol. 446, 526-529 p.Article in journal (Refereed) Published
Abstract [en]

The hydrogen induced resistivity changes in Cr/VHx(0 0 1) superlattices where investigated in the concentration range 0<x<0.7. Initially, the resistivity increases with H content, reaching a maximum at H/V≈0.5 atomic ratio. At concentration above 0.5, the resistivity decreases with increasing H concentration. These results are in stark contrast to the H induced resistivity changes in Fe/V(0 0 1) superlattices, in which the resistivity increases monotonically up to H/V≈1. The results unambiguously prove the importance of the interface scattering, which calls for better theoretical description of the H induces changes in the electronic structure in this type of materials.

Place, publisher, year, edition, pages
2007. Vol. 446, 526-529 p.
Keyword [en]
Hydrogen, Resistivity, Crystal structure
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-96566DOI: 10.1016/j.jallcom.2007.01.094ISI: 000250822900112OAI: oai:DiVA.org:uu-96566DiVA: diva2:171183
Available from: 2007-12-18 Created: 2007-12-18 Last updated: 2011-04-13Bibliographically approved
In thesis
1. Amorphous, Nanocrystalline, Single Crystalline: Morphology of Magnetic Thin Films and Multilayers
Open this publication in new window or tab >>Amorphous, Nanocrystalline, Single Crystalline: Morphology of Magnetic Thin Films and Multilayers
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Properties of magnetic thin film devices cannot be understood without detailed knowledge of their structure. For this purpose, a variety of thin film and multilayer systems have been studied. Both reciprocal space (low energy electron diffraction, reflection high energy electron diffraction, X-ray diffraction and reflectometry) and direct space (transmission electron microscopy) as well as Rutherford backscattering spectrometry have been applied.

To gain understanding of an oxidation procedure for the growth of magnetite layers, thermal stability of iron layers on molybdenum seed layers has been investigated.

Following the mosaicity and the out-of-plane coherence length over different ratios between the constituting layers allowed a deeper understanding of the limits of metallic superlattices. This, together with an approach to use hydrogen in the process gas during magnetron sputter epitaxy, opens routes for the growth of metallic superlattices of superior quality.

A non-isostructural multilayer/superlattice system, Fe/MgO, has been investigated. In turn, this gave more understanding how superlattice diffraction patterns are suppressed by strain fields.

As an alternative route to single-crystalline superlattices, amorphous multilayers present interesting opportunities. In this context, crystallization effects of iron/zirconium layers on alumiunium oxide were studied. Understanding these effects enables significant improvement in the quality of amorphous multilayers, and allows avoiding these, growing truly amorphous layers.

Both the substantial improvement in quality of metallic superlattices, approaching true single-crystallinity, as well as the improvements in the growth of amorphous multilayers give rise to opportunities in the field of magnetic coupling and superconducting spin valves.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 77 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 378
Keyword
Physics, Multilayer, Superlattice, X-ray diffraction, X-ray reflectometry, electron diffraction, Rutherford backscattering spectrometry, Interdiffusion, thin film growth, transmission electron microscopy, Epitaxial growth, Fysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-8355 (URN)978-91-554-7055-5 (ISBN)
Public defence
2008-01-18, Polhemssalen, Ångströmlaboratoriet, Lagerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2007-12-18 Created: 2007-12-18 Last updated: 2010-03-09Bibliographically approved

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Liebig, AndreasHjörvarsson, Björgvin

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