Long-range antiferromagnetic order in epitaxial Mn2GaC thin films from neutron reflectometry
2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 94, no 2, 024416- p.Article in journal (Refereed) PublishedText
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.
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:liu:diva-130382DOI: 10.1103/PhysRevB.94.024416ISI: 000379501200005OAI: oai:DiVA.org:liu-130382DiVA: diva2:952768
Funding Agencies|European Research Council (ERC) under the European Communitys Seventh Framework Programme FP7 (ERC Grant) ; Swedish Research Council [621-2012-4425]; Knut and Alice Wallenberg Foundation program2016-08-152016-08-052016-09-08