Berlin 2015 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 2: Symposium on Ferroic Domain Walls
DF 2.5: Hauptvortrag
Montag, 16. März 2015, 12:00–12:30, H 0105
Controlling and mapping domain wall behaviour in ferroelectrics — •John Martin Gregg1, Jonathan Whyte1, Raymond McQuaid1, Michael Campbell1, Amit Kumar1, and Roger Whatmore2 — 1Queens University Belfast, Belfast, Northern Ireland, UK — 2Imperial College London, London, England
Over the last decade there has been an explosion of interest in sheet conductors, such as surface states in topological insulators [1], LaAlO3-SrTiO3 interfaces [2] and graphene. Recent research has shown that ferroic domain walls constitute another exciting group of 2D conductors, with probably even greater potential than those already known: after all, domain walls have special properties in that they are mobile, can be controllably shunted from point to point, and can be spontaneously created, or made to disappear. Luckily for the research community, the field of domain wall nanoelectronics [3] is still young and there is consequently a great deal left to discover.
In this talk, the extent to which ideas developed in the nanomagnetics community can be adapted to allow domain wall injection [4] and motion control in ferroelectrics, as needed for domain wall-based devices, will be discussed. In addition, results from experiments to determine the fundamental nature of conduction in both boracite and manganite domain walls will be presented.
[1] H. Zhang et al. Nature Physics 5, 438 (2009)
[2] A. Ohtomo and H. Y. Hwang, Nature 427, 423 (2004)
[3] G. Catalan et al. Rev. Mod. Phys. 84 119 (2012)
[4] J. R. Whyte et al. 26, 293 (2014)