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Magnetic moments in FeCo/Pt (001) superlattices
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
2008 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 320, no 21, 2660-2664 p.Article in journal (Refereed) Published
Abstract [en]

The element specific spin and orbital moments for Fe and Co in Fe40Co60/Pt (001) superlattices, with layer thicknesses d(FeCo) = 4-10 ML and d(Pt) = 8 ML, have been studied by X-ray magnetic circular dichroism with focus on the interfacial magnetic moments of the Fe40Co60 layers. The spin moments of Fe and Co showed the same relative decrease at the interfaces with respect to the bulk alloy. The change at the interface was found to be -0.9(1) of the bulk alloy spin moment. The orbital moment for Fe also decreased at the interfaces, whereas the Co orbital moment did not show any appreciable change at the interfaces. In addition, SQUID measurements of the total magnetization allowed the extraction of the induced Pt magnetic moment, which was found to be 0.6(3)mu B/atom and is discussed with respect to previous studies.

Place, publisher, year, edition, pages
2008. Vol. 320, no 21, 2660-2664 p.
Keyword [en]
interface, superlattice, magnetic property and measurement
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-95889DOI: 10.1016/j.jmmm.2008.05.029ISI: 000258395400021OAI: oai:DiVA.org:uu-95889DiVA: diva2:170259
Available from: 2007-05-08 Created: 2007-05-08 Last updated: 2017-12-14
In thesis
1. A Structural Viewpoint of Magnetism in Fe and Co Based Superlattices
Open this publication in new window or tab >>A Structural Viewpoint of Magnetism in Fe and Co Based Superlattices
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In order to understand the properties of thin film devices, knowledge of the material's structure is essential. The work presented here combines magnetic and structural characterization of the systems studied to gain a deeper physical understanding. The magnetic properties have been studied with a combination of x-ray magnetic circular dichroism, SQUID magnetometry and magneto-optical Kerr effect. For the structural characterization, x-ray reflectivity and diffraction have been used, complemented by neutron diffraction and transmission electron microscopy.

One structural property that affects the magnetic moment in metal-on-metal superlattices is interdiffusion between the layers. This is discussed for bcc Fe/Co(001) and bcc Fe81Ni19/Co(001) superlattices. The effect of interdiffusion was seen as a large region of enhanced magnetic moments as compared to theoretical calculations, which assume perfectly sharp interfaces. For the Fe81Ni19/Co(001) superlattices the chemical interface region, as revealed by neutron diffraction, was in good agreement with the region of magnetic enhancement.

Another structural property that has been investigated is the strain in the magnetic layers. This does not affect the spin magnetic moment to a large extent. However the magnetocrystalline anisotropy and the orbital moment are affected by the presence of strain. The effects on the orbital moment from strain and interfaces for Fe in Fe/V superlattices was studied, and it was found that the two contributions were separable.

In this context the effect of strain on the out-of-plane magnetocrystalline anisotropy in FeCo/Pt has also been studied. The latter system is interesting from a technological perspective since tetragonally distorted FeCo alloys have the potential to be suitable new materials in computer hard drives.

Finally, a computer program, based on the Differential Evolution algorithm, to refine primarily x-ray reflectivity data, is presented.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 92 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 308
Keyword
Physics, Magnetism, Multilayer, Superlattice, X-ray magnetic circular dichroism, X-ray diffraction, X-ray reflectivity, Neutron diffraction, Structural refinement, Interfaces, Fysik
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-7886 (URN)978-91-554-6891-0 (ISBN)
Public defence
2007-06-01, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2007-05-08 Created: 2007-05-08 Last updated: 2011-11-17Bibliographically approved

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Björck, MattsAndersson, Gabriella

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