Temperature-induced phase transition from cycloidal to collinear antiferromagnetism in multiferroic Bi0.9Sm0.1FeO3 driven by f-d induced magnetic anisotropy
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 5, 054420Article in journal (Refereed) Published
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
Condensed Matter Physics Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-319096DOI: 10.1103/PhysRevB.95.054420ISI: 000393942400006OAI: oai:DiVA.org:uu-319096DiVA: diva2:1086695
FunderSwedish Research Council, 621-2011-3851EU, Horizon 2020, 645660