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Long-range antiferromagnetic order in epitaxial Mn2GaC thin films from neutron reflectometry
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering.
Uppsala University, Sweden; Institute Laue Langevin, France.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-5036-2833
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 94, no 2, 024416- p.Article in journal (Refereed) Published
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Abstract [en]

The nature of the magnetic structure in magnetic so-called MAX phases is a topic of some controversy. Here we present unpolarized neutron-diffraction data between 3.4 and 290.0 K and momentum transfer between Q = 0.0 and 1.1 angstrom(-1), as well as complementary x-ray-diffraction data on epitaxial thin films of the MAX phase material Mn2GaC. This inherently layered material exhibits neutron-diffraction peaks consistent with long-ranged antiferromagnetic order with a periodicity of two structural unit cells. The magnetic structure is present throughout the measured temperature range. The results are in agreement with first-principles calculations of antiferromagnetic structures for this material where the Mn-C-Mn atomic trilayers are found to be ferromagnetically coupled internally but spin flipped or rotated across the Ga layers. The present findings have significant bearing on the discussion regarding the nature of the magnetic structure in magnetic MAX phases.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2016. Vol. 94, no 2, 024416- p.
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Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-130382DOI: 10.1103/PhysRevB.94.024416ISI: 000379501200005OAI: oai:DiVA.org:liu-130382DiVA: diva2:952768
Note

Funding Agencies|European Research Council (ERC) under the European Communitys Seventh Framework Programme FP7 (ERC Grant) [258509]; Swedish Research Council [621-2012-4425]; Knut and Alice Wallenberg Foundation program

Available from: 2016-08-15 Created: 2016-08-05 Last updated: 2017-11-03

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Ingason, Arni SigurdurDahlqvist, MartinRosén, Johanna

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