Pyramidal domain walls in ferroelectric BiFeO3

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Domain structures are central to the unique electric, mechanical, and other functional properties of ferroelectric materials, playing a pivotal role in their applications. In this seminar, I will discuss our recent progress in understanding the formation of zigzag charged domain structures in the prototypical multiferroic material BiFeO3 (and also in PbTiO3 and BaTiO3). 

Using phase-field simulations within the Landau-Ginzburg-Devonshire framework, we uncovered that spatially (approximately) homogeneous defect charges can drive the formation of domain patterns closely resembling those observed experimentally. This insight provides a clearer understanding of the physical origins behind these zigzag structures and the mechanisms governing their behavior. 

By understanding and controlling the underlying physics of pyramidal-domain formation, we could engineer materials with self-assembled domain structures exhibiting defined periodicities at the nanometer scale, which might turn useful for applications.

The seminar will be chaired by Hynek Němec, Department of Dielectrics.