Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 38: Multiferroics I (DF with MA)
MA 38.3: Vortrag
Donnerstag, 10. März 2016, 10:10–10:30, H25
Multiferroic clusters: a new perspective for relaxor-type room-temperature multiferroics — •Leonard Henrichs1,2, Oscar Cespedes3, Wolfgang Kleemann4, and Andrew Bell2 — 1Karlsruher Institut für Technologie, Institut für Angewandte Geowissenschaften, Germany — 2University of Leeds, Institute for Materials Research, United Kingdom — 3University of Leeds, School of Physics and Astronomy, United Kingdom — 4University of Duisburg-Essen, Faculty of Physics, Germany
Multiferroics are promising for sensor and memory applications. However, no single-phase material displaying both ferroelectricity and large magnetization at room-temperature has hitherto been reported. This situation has substantially been improved in the novel relaxor ferroelectric (BiFe0.9Co0.1O3)0.4-(Bi1/2K1/2TiO3)0.6, where polar nanoregions (PNR) transform into static-PNR (SPNR) and simultaneously enable congruent multiferroic clusters (MFC) to emerge from inherent Bi(Fe,Co)O3 rich regions. The MFC supposedly are ferrimagnetic. On these MFC, exceptionally large direct and converse magnetoelectric coupling coefficients, α * 1.0 x 10-5 s/m at room-temperature, were measured by PFM and MFM respectively. We expect the non-ergodic relaxor properties which are governed by the Bi1/2K1/2TiO3 component to play a vital role in the strong ME coupling. The extremely high Neel temperature of approx. 690 K, as verified by neutron diffraction, further underlines the exceptional magnetic properties of the material. This new class of non-ergodic relaxor multiferroics bears great potential for applications.