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Quantitative magnetic information from reciprocal space maps in transmission electron microscopy
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Experimental Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Materials Theory.
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, Materials Physics.
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2009 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 102, no 3, 037201- p.Article in journal (Refereed) Published
Abstract [en]

One of the most challenging issues in the characterization of magnetic materials is to obtain a quantitative analysis on the nanometer scale. Here we describe how electron magnetic circular dichroism (EMCD) measurements using the transmission electron microscope can be used for that purpose, utilizing reciprocal space maps. Applying the EMCD sum rules, an orbital to spin moment ratio of mL/mS=0.08±0.01 is obtained for Fe, which is consistent with the commonly accepted value. Hence, we establish EMCD as a quantitative element-specific technique for magnetic studies, using a widely available instrument with superior spatial resolution.

Place, publisher, year, edition, pages
2009. Vol. 102, no 3, 037201- p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-101298DOI: 10.1103/PhysRevLett.102.037201ISI: 000262723700058OAI: oai:DiVA.org:uu-101298DiVA: diva2:212480
Available from: 2009-04-22 Created: 2009-04-22 Last updated: 2017-01-25Bibliographically approved
In thesis
1. Transmission Electron Microscopy for Characterization of Structures, Interfaces and Magnetic Moments in Magnetic Thin Films and Multilayers
Open this publication in new window or tab >>Transmission Electron Microscopy for Characterization of Structures, Interfaces and Magnetic Moments in Magnetic Thin Films and Multilayers
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Structural characterization is essential for the understanding of the magnetic properties of thin films and multilayers. In this thesis, both crystalline and amorphous thin films and multilayers were analyzed utilizing transmission electron microscopy (TEM). High resolution TEM and electron diffraction studies emphasize on the growth of amorphous Fe91Zr9 and Co68Fe24Zr8 on both Al2O3 and Al70Zr30 in multilayer structures by magnetron sputtering. The properties of the growth surfaces were found to strongly influence the formation of nano-crystallites of the magnetic material at interfaces. Field induced uniaxial magnetic anisotropy was found to be possible to imprint into both fully amorphous and partially crystallized Co68Fe24Zr8 layers, yielding similar magnetic characteristics regardless of the structure. These findings are important for the understanding of both growth and magnetic properties of these amorphous thin films.

As magnetic systems become smaller, new analysis techniques need to be developed. One such important step was the realization of electron energy-loss magnetic circular dichroism (EMCD) in the TEM, where information about the ratio of the orbital to spin magnetic moment (mL/mS) of a sample can be obtained. EMCD makes use of angular dependent inelastic scattering, which is characterized using electron energy-loss spectroscopy. The work of this thesis contributes to the development of EMCD by performing quantitative measurements of the mL/mS ratio. Especially, methods for obtaining energy filtered diffraction patterns in the TEM together with analysis tools of the data were developed. It was found that plural inelastic scattering events modify the determination of the mL/mS ratio, wherefore a procedure to compensate for it was derived. Additionally, utilizing special settings of the electron gun it was shown that EMCD measurements becomes feasible on the nanometer level through real space maps of the EMCD signal.

 

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 86 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 669
Keyword
Transmission electron microscopy, TEM, magnetism, multilayer, superlattice, thin films, amorphous metals, electron energy-loss magnetic circular dichroism, EMCD, electron diffraction
National Category
Condensed Matter Physics Condensed Matter Physics Physical Sciences
Research subject
Engineering Science with specialization in Solid State Physics; Physics of Matter
Identifiers
urn:nbn:se:uu:diva-107941 (URN)978-91-554-7599-4 (ISBN)
Public defence
2009-10-16, Polhemsalen, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
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Supervisors
Available from: 2009-09-24 Created: 2009-09-01 Last updated: 2011-05-02Bibliographically approved

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Lidbaum, HansRusz, JanBjörgvin, HjörvarssonOppeneer, PeterCoronel, ErnestoEriksson, OlleLeifer, Klaus

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