AI Article Synopsis
- A study on the new Pmc21 phase of BiFeO3 reveals a unique magnetoelectric effect allowing magnetism to be controlled by an electric field.
- This process involves a two-step mechanism: first, altering polarization changes the oxygen octahedra rotation, then this shift influences the magnetic order.
- The effects are driven by specific trilinear couplings between polarization, tilting of the octahedra, and magnetic orders, standing out from similar phenomena in other materials due to their presence in a basic ABO3 perovskite structure with significant polarization.
Article Abstract
We report a first-principles study of the recently predicted Pmc21 phase of the multiferroic BiFeO3 material, revealing a novel magnetoelectric effect that makes it possible to control magnetism with an electric field. The effect can be viewed as a two-step process: Switching the polarization first results in the change of the sense of the rotation of the oxygen octahedra, which in turn induces the switching of the secondary magnetic order parameter. The first step is governed by an original trilinear-coupling energy between polarization, octahedral tilting, and an antiferroelectric distortion. The second step is controlled by another trilinear coupling, this one involving the predominant and secondary magnetic orders as well as the oxygen octahedral tilting. In contrast with other trilinear-coupling effects in the literature, the present ones occur in a simple ABO3 perovskite and involve a large polarization.
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| http://dx.doi.org/10.1103/PhysRevLett.112.057202 | DOI Listing |
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