Temperature-induced phase transition from cycloidal to collinear antiferromagnetism in multiferroic Bi0.9Sm0.1FeO3 driven by f-d induced magnetic anisotropy
Artikel i vetenskaplig tidskrift, 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.

neutron-diffraction

crystal

heat

substituted bifeo3 ceramics

Physics

weak ferromagnetism

Författare

R. D. Johnson

University of Oxford

ISIS Facility

P. A. McClarty

ISIS Facility

D. D. Khalyavin

ISIS Facility

P. Manuel

ISIS Facility

P. Svedlindh

Uppsala Universitet

Christopher Knee

Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Physical Review B

24699950 (ISSN) 24699969 (eISSN)

Vol. 95 054420

Ämneskategorier

Oorganisk kemi

Annan fysik

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.95.054420