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Temperature-induced phase transition from cycloidal to collinear antiferromagnetism in multiferroic Bi0.9Sm0.1FeO3 driven by f-d induced magnetic anisotropy
Rutherford Appleton Lab STFC, ISIS Facil, Didcot OX11 0QX, Oxon, England.;Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England..
Rutherford Appleton Lab STFC, ISIS Facil, Didcot OX11 0QX, Oxon, England..
Rutherford Appleton Lab STFC, ISIS Facil, Didcot OX11 0QX, Oxon, England..
Rutherford Appleton Lab STFC, ISIS Facil, Didcot OX11 0QX, Oxon, England..
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2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 5, 054420Article in journal (Refereed) Published
Abstract [en]

In multiferroic BiFeO3 a cycloidal antiferromagnetic structure is coupled to a large electric polarization at room temperature, giving rise to magnetoelectric functionality that may be exploited in novel multiferroic-based devices. In this paper, we demonstrate that substituting samarium for 10% of the bismuth ions increases the periodicity of the room-temperature cycloid, and upon cooling to below similar to 15 K the magnetic structure tends towards a simple G-type antiferromagnet, which is fully established at 1.5 K. We show that this transition results from f-d exchange coupling, which induces a local anisotropy on the iron magnetic moments that destroys the cycloidal order-a result of general significance regarding the stability of noncollinear magnetic structures in the presence of multiple magnetic sublattices.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 95, no 5, 054420
National Category
Condensed Matter Physics Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-319096DOI: 10.1103/PhysRevB.95.054420ISI: 000393942400006OAI: oai:DiVA.org:uu-319096DiVA: diva2:1086695
Funder
Swedish Research Council, 621-2011-3851EU, Horizon 2020, 645660
Available from: 2017-04-03 Created: 2017-04-03 Last updated: 2017-04-07Bibliographically approved

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