Tri-layer superlattices: A route to magnetoelectric multiferroics?

Details Tri-layer superlattices: A route to magnetoelectric multiferroics? Tri-layer superlattices: A route to magnetoelectric multiferroics?

2007-04-05

arxiv.org/abs/0704.0781v3

Appl. Phys. Lett. 90, 242916 (2007)

Physics

Condensed Matter

Materials Science

10 pages, 3 figures; references added, and minor editorial changes made

Scientific paper

10.1063/1.2748855

We explore computationally the formation of tri-layer superlattices as an alternative approach for combining ferroelectricity with magnetism to form magnetoelectric multiferroics. We find that the contribution to the superlattice polarization from tri-layering is small compared to typical polarizations in conventionalferroelectrics, and the switchable ferroelectric component is negligible. In contrast, we show that epitaxial strain and ``negative pressure'' can yield large, switchable polarizations that are compatible with the coexistence of magnetism, even in materials with no active ferroelectric ions.

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