Vortex Domain Walls in Ferroelectrics

Author(s): Hong, Zijian; Das, Sujit; Nelson, Christopher; Yadav, Ajay; Wu, Yongjun; Junquera, Javier; Chen, Long-Qing; Martin, Lane W; Ramesh, Ramamoorthy | Abstract: Controlling the domain formation in ferroelectric materials at nanoscale is a fertile ground to explore emergent phenomena and their technological prospects. For example, charged walls BiFeO3 ErMnO3 exhibit significantly enhanced conductivity which could serve as foundation for next-generation circuits (Estevez Laurson, Phys. Rev. B 2015, 91, 054407). Here, we describe concept polar vortices perform same role wall classical structures with key difference being that can accommodate (i.e., head-to-head tail-to-tail) domains, PbTiO3/dielectric SrTiO3 superlattices. Such vortex structure be manipulated reversible fashion under an external applied field.