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DF: Fachverband Dielektrische Festkörper

DF 17: Ferroics - Domains, Domain Walls and Skyrmions IV

DF 17.6: Vortrag

Donnerstag, 23. März 2017, 11:15–11:30, WIL B321

Strong magnetoelectric coupling within ceramic core-shell structures — •Leonard Henrichs¹, Torsten Scherer¹, James Benett², Andrew Bell², Oscar Cespedes², and Christian Kübel¹ — ¹Karlsruhe Insitute of Technology, Karlsruhe, Germany — ²University of Leeds, Leeds, United Kingdom

In perovskite ceramics of the composition BiFe_0.9Co_0.1O₃)_0.4−Bi_1/2K_1/2TiO₃)_0.6, novel nano-sized regions called multiferroic clusters (MFC) were recently discovered. These MFC belong to so-called core-shell structures as known from other relaxor ferroelectrics, where BiFe_1−xCo_xO₃-rich cores are surrounded by a Bi_1/2K_1/2TiO₃-rich shell within one grain. The MFC exhibit exceptionally large direct and converse local ME coupling. The observed electric-field induced switching of magnetization is especially interesting in terms of applications, since it enables in principle electrically driven magnetic memory, one of the ’holy grails’ in information technology research. It is assumed that the strong magnetism stems from ferrimagnetic order of Fe and Co in MFC, which requires a superstructure of Fe and Co on the B lattice site. The main unsolved question in this system is, why the exceptional multiferroic properties occur in the BiFe_1−xCo_xO₃-rich Cores, but have never been observed in pure BiFe_1−xCo_xO₃ compounds. An explanation might be epitaxial strain originating from the core-shell structure. It is anticipated, that deeper understanding of the MFC might give valuable insights for the design e.g. of a thin-film material with similar multiferroic properties like the MFC.