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Textured growth of the high moment material Gd(0001)/Cr(001)/Fe(001)
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2011 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 44, no 26, 265004- p.Article in journal (Refereed) Published
Abstract [en]

By magnetic coupling of Fe and Gd via Cr interlayers, the large local moment of Gd can be combined with the high Curie temperature of Fe. The textured growth of a Gd film is studied here by preparing trilayer systems of Fe/Cr/Gd on MgO(1 0 0) substrates by molecular-beam epitaxy (MBE). The thickness of the Cr interlayer was varied between 3 and 5 monolayers. The structural quality of the samples was confirmed by in situ RHEED and ex situ XRD measurements. Epitaxial Cr(0 0 1)/Fe(0 0 1) growth was observed, as expected. By use of Fe-57-CEMS (conversion electron Mossbauer spectroscopy) in combination with the Fe-57 tracer layer method the Fe/Cr interface could be examined on an atomic scale and well separated Fe/Gd layers for all Cr thicknesses were confirmed. The unusual Gd/Cr crystallographic relationship of Gd(0 0 0 1)parallel to Cr(0 0 1), with domains of the hexagonal Gd basal planes randomly oriented in the sample plane and not in registry with the underlying Cr(0 0 1) lattice, was found from combined RHEED and x-ray measurements. Annealing of the samples resulted in a remarkable improvement of the crystalline structure of the Gd layers. On the other hand, the appearance of a single line in the CEM spectrum leads to the conclusion that during annealing a small amount of Fe diffuses into the Cr layer. The electronic structure and magnetism of this system are investigated by first-principles theory.

Place, publisher, year, edition, pages
2011. Vol. 44, no 26, 265004- p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-155926DOI: 10.1088/0022-3727/44/26/265004ISI: 000291685100006OAI: oai:DiVA.org:uu-155926DiVA: diva2:429583
Available from: 2011-07-05 Created: 2011-07-04 Last updated: 2017-12-11Bibliographically approved

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Sanyal, BiplabEriksson, Olle

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