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Highly amorphous Fe90Zr10 thin films, and the influence of crystallites on the magnetism
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
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2010 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 519, no 1, 404-409 p.Article in journal (Refereed) Published
Abstract [en]

A method for depositing highly amorphous, iron-rich Fe100-xZrx thin films on to room temperature substrates is presented. The method involves co-depositing Fe and Zr on to an amorphous AlZr layer. Experimental proof that the structures are completely amorphous is given by transmission electron microscopy and polarized neutron reflectometry. The reflectometry measurements also give an indication of the impact that Fe crystallite impurities have on the magnetic structure and properties of amorphous FeZr. The results are consistent with previous investigations on bulk samples, which showed that crystalline impurities make the magnetic structure more non-collinear.

Place, publisher, year, edition, pages
2010. Vol. 519, no 1, 404-409 p.
Keyword [en]
Amorphous films, TEM, Neutron reflectometry, Magnetism
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-139378DOI: 10.1016/j.tsf.2010.07.084ISI: 000283955200071OAI: oai:DiVA.org:uu-139378DiVA: diva2:381347
Available from: 2010-12-27 Created: 2010-12-23 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Uncovering Magnetic Order in Nanostructured Disordered Materials: A Study of Amorphous Magnetic Layered Structures
Open this publication in new window or tab >>Uncovering Magnetic Order in Nanostructured Disordered Materials: A Study of Amorphous Magnetic Layered Structures
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The scope of this thesis is the study of the interplay between structure and magnetism in amorphous materials. The investigations focus on the growth of amorphous layers and the study of the influence of structural disorder and reduced physical extension on the magnetic properties of thin films and multilayers. The examined magnetic materials are FeZr alloys, as well as other amorphous transition metal alloys such as CoZr and FeCoZr.

Thin films and multilayers of the studied materials were deposited using magnetron sputtering in ultra-high vacuum conditions. Their amorphous structure and layering quality was investigated using X-ray scattering techniques and in several cases with transmission electron microscopy. The chemical composition of the alloys was determined with Rutherford Backscattering Spectrometry. The magnetic properties were investigated using the magneto-optic Kerr effect and SQUID magnetometry, as well as polarized neutron reflectometry and X-ray magnetic circular dicroism measurements.

For FeZr alloys deposited as multilayers with Al2O3 as spacer layer, it was found that Fe-rich nanocrystallites, formed at the metal/oxide interfaces, exert large influence on the magnetic properties. The use of AlZr alloys as buffer layers promotes the growth of highly amorphous FeZr layers. FeZr/AlZr multilayers with good layering quality can also be obtained. The influence of the reduced layer thickness on the magnetic moment, Curie temperature and magnetic dimensionality of the magnetic layers is addressed for FeZr/AlZr multilayers. Thin FeZr layers in these structures are found to belong to the 2D XY dimensionality class. The change of the magnetic moment and Curie temperature with reduced FeZr layer thickness is quantified.

In addition, the induced magnetic moment in the alloy element Zr was investigated in FeZr and CoZr alloy films. The possibility to imprint a preferred magnetization direction during thin film preparation was demonstrated for FeCoZr layers. Lastly, AlZr alloy films were studied with respect to their oxidation stability at room and elevated temperatures, aiming towards development of materials with passivating properties.

Place, publisher, year, edition, pages
Uppsala: Uppsala Universitet, 2011. 124 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 865
Keyword
Amorphous Materials, Magnetism, Amorphous Magnetism, Magnetic Measurements, Thin Films, Multilayers, Thin Film Deposition, Sputtering, FeZr Alloys, AlZr Alloys, X-ray Diffraction, Rutherford Backscattering Spectrometry
National Category
Condensed Matter Physics
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-159913 (URN)978-91-554-8181-0 (ISBN)
Public defence
2011-11-24, Polhelmsalen, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Supervisors
Available from: 2011-11-03 Created: 2011-10-11 Last updated: 2012-02-23Bibliographically approved

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Korelis, Panagiotis T.Björck, MattsHjörvarsson, BjörgvinLidbaum, HansLeifer, Klaus

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