uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
The influence of weak links on magnetic ordering in layered structures
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Show others and affiliations
2008 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 61, no 1, 17008- p.Article in journal (Refereed) Published
Abstract [en]

We discuss the magnetic ordering in layered magnets with two different inherent ordering temperatures. A [V(12 ML)Fe(2 ML)/V(12 ML)(/Fe(3 ML)](70) superlattice with anti-ferromagnetic interlayer exchange coupling is used for this purpose. The more rapid decrease of the magnetic moment in the 2 monolayer thick Fe layers influences the ordering in a non-trivial way. A distribution of the effective ordering temperature is inferred, originating from a more rapid decrease of the magnetic moment in the near-surface region, as compared to the interior of the sample. The results clearly demonstrate the need to consider all energy and length scales when addressing ordering in materials with finite extension.

Place, publisher, year, edition, pages
2008. Vol. 61, no 1, 17008- p.
National Category
Physical Sciences Engineering and Technology
URN: urn:nbn:se:uu:diva-96567DOI: 10.1209/0295-5075/81/17008ISI: 000251648600024OAI: oai:DiVA.org:uu-96567DiVA: diva2:171184
Available from: 2007-12-18 Created: 2007-12-18 Last updated: 2016-04-13
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.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 378
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
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)
Available from: 2007-12-18 Created: 2007-12-18 Last updated: 2010-03-09Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Hjörvarsson, BjörgvinWolff, MaxNordblad, Per
By organisation
Department of PhysicsSolid State Physics
In the same journal
Europhysics letters
Physical SciencesEngineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 448 hits
ReferencesLink to record
Permanent link

Direct link