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Long-range antiferromagnetic order in epitaxial Mn2GaC thin films from neutron reflectometry
Linkoping Univ, Thin Film Phys, Dept Phys Chem & Biol IFM, SE-58183 Linkoping, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. Inst Laue Langevin, F-38000 Grenoble, France..
Linkoping Univ, Thin Film Phys, Dept Phys Chem & Biol IFM, SE-58183 Linkoping, Sweden..
Linkoping Univ, Thin Film Phys, Dept Phys Chem & Biol IFM, SE-58183 Linkoping, Sweden..
2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 94, no 2, 024416Article in journal (Refereed) PublishedText
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
2016. Vol. 94, no 2, 024416
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-300455DOI: 10.1103/PhysRevB.94.024416ISI: 000379501200005OAI: oai:DiVA.org:uu-300455DiVA: diva2:951502
Funder
EU, FP7, Seventh Framework Programme, 258509Swedish Research Council, 621-2012-4425Knut and Alice Wallenberg Foundation
Available from: 2016-08-09 Created: 2016-08-09 Last updated: 2016-08-09Bibliographically approved

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Pálsson, Gunnar K.
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Materials Physics
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