Polarization control at spin-driven ferroelectric domain walls

Naëmi Leo, Anders Bergman, Andres Cano, Narayan Poudel, Bernd Lorenz, Manfred Fiebig and Dennis Meier ()
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Naëmi Leo: ETH Zürich
Anders Bergman: Uppsala University
Andres Cano: CNRS, University of Bordeaux, ICMCB
Narayan Poudel: University of Houston
Bernd Lorenz: University of Houston
Manfred Fiebig: ETH Zürich
Dennis Meier: ETH Zürich

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Unusual electronic states arise at ferroelectric domain walls due to the local symmetry reduction, strain gradients and electrostatics. This particularly applies to improper ferroelectrics, where the polarization is induced by a structural or magnetic order parameter. Because of the subordinate nature of the polarization, the rigid mechanical and electrostatic boundary conditions that constrain domain walls in proper ferroics are lifted. Here we show that spin-driven ferroelectricity promotes the emergence of charged domain walls. This provides new degrees of flexibility for controlling domain-wall charges in a deterministic and reversible process. We create and position a domain wall by an electric field in Mn0.95Co0.05WO4. With a magnetic field we then rotate the polarization and convert neutral into charged domain walls, while its magnetic properties peg the wall to its location. Using atomistic Landau–Lifshitz–Gilbert simulations we quantify the polarization changes across the two wall types and highlight their general occurrence.

Date: 2015
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DOI: 10.1038/ncomms7661

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