Topological structures as nanoscale functional elements: The case of domain walls in multiferroic oxides

Prof. Jan Seidel. School of Materials Science and Engineering, UNSW Australia, Sydney

Domain walls in complex oxides have recently received increased attention due to the fact that their properties, which are linked to the inherent order parameters of the material, its structure and symmetry, can be completely different from that of the parent bulk material [1]. I will present an overview of recent results regarding new intrinsic properties of multiferroic phase boundaries, domain walls, and other topological defects in multiferroic materials [2, 3, 4]. The origin and nature of the observed confined nanoscale properties are probed using a combination of nanoscale transport measurements based on scanning probe methods, high resolution transmission electron microscopy and first-principles density functional theory. I will also give an outlook on how these special properties can be found in other material systems and discuss possible future applications of domain walls as nanoscale functional elements [5].

[1] J. Seidel, et al., Nature Materials 8, 229 (2009)
[2] J. Seidel, et al., Advanced Materials 26, 4376 (2014)
[3] Y. Heo, et al., Advanced Materials 26, 7568 (2014)
[4] G. Catalan, J. Seidel, et al., Reviews of Modern Physics 84, 119 (2012)
[5] J. Seidel, Nature Nanotechnology 10, 190 (2015)

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