Temperature-induced phase transition from cycloidal to collinear antiferromagnetism in multiferroic Bi0.9Sm0.1FeO3 driven by f-d induced magnetic anisotropy
Journal article, 2017

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.

heat

crystal

weak ferromagnetism

neutron-diffraction

Physics

substituted bifeo3 ceramics

Author

R. D. Johnson

University of Oxford

STFC Rutherford Appleton Laboratory

P. A. McClarty

STFC Rutherford Appleton Laboratory

D. D. Khalyavin

STFC Rutherford Appleton Laboratory

P. Manuel

STFC Rutherford Appleton Laboratory

P. Svedlindh

Uppsala University

Christopher Knee

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Physical Review B

24699950 (ISSN) 24699969 (eISSN)

Vol. 95 5 054420

Enhanced multiferroic behaviour in co-doped BiFeO3 via bulk synthesis and thin film deposition routes

Swedish Research Council (VR) (2011-3851), 2012-01-01 -- 2014-12-31.

Subject Categories

Inorganic Chemistry

Other Physics Topics

Condensed Matter Physics

DOI

10.1103/PhysRevB.95.054420

More information

Latest update

5/20/2021