Physics – Condensed Matter – Materials Science
Scientific paper
2008-06-03
Physics
Condensed Matter
Materials Science
15 pages, 3 images, to appear in J. Phys: Condens. Matter Focus Issue on Multiferroics
Scientific paper
10.1088/0953-8984/20/43/434219
In this article we review and discuss a mechanism for coupling between electric polarization and magnetization that can ultimately lead to electric-field switchable magnetization. The basic idea is that a ferroelectric distortion in an antiferromagnetic material can "switch on" the Dzyaloshinskii-Moriya interaction which leads to a canting of the antiferromagnetic sublattice magnetizations, and thus to a net magnetization. This magnetization M is coupled to the polarization P via a trilinear free energy contribution of the form P(M x L), where L is the antiferromagnetic order parameter. In particular, we discuss why such an invariant is present in R3c FeTiO_3 but not in the isostructural multiferroic BiFeO_3. Finally, we construct symmetry groups that in general allow for this kind of ferroelectrically-induced weak ferromagnetism.
Ederer Claude
Fennie Craig J.
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