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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

R. D. Johnson ; P. A. McClarty ; D. D. Khalyavin ; P. Manuel ; P. Svedlindh ; Christopher S Knee (Institutionen för kemi och kemiteknik, Oorganisk miljökemi)
Physical Review B (2469-9950). Vol. 95 (2017), 5,
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: substituted bifeo3 ceramics, weak ferromagnetism, neutron-diffraction, crystal, heat, Physics

Denna post skapades 2017-03-31. Senast ändrad 2017-07-07.
CPL Pubid: 248760


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Denna publikation är ett resultat av följande projekt:

Enhanced multiferroic behaviour in co-doped BiFeO3 via bulk synthesis and thin film deposition routes (VR//2011-3851)