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MA: Fachverband Magnetismus

MA 38: Multiferroics I (DF with MA)

MA 38.2: Vortrag

Donnerstag, 10. März 2016, 09:50–10:10, H25

Design and synthesis of a room temperature multiferroic bulk oxide — Pranab Mandal¹, •Michael Pitcher¹, Jonathan Alaria², Hongjun Niu¹, Pavel Borisov¹, Plamen Stamenov³, John Claridge¹, and Matthew Rosseinsky¹ — ¹Department of Chemistry, University of Liverpool, Liverpool, UK — ²Department of Physics, University of Liverpool, Liverpool, UK — ³CRANN, Trinity College Dublin, Ireland

A new generation of low-power high-density information storage would be enabled by the development of multiferroic materials that combine switchable electrical polarisation (conventionally arising from second order Jahn-Teller distortion of d⁰ cations) with spontaneous magnetisation (from long range ordering of unpaired d electrons) within a single phase material. Combining these properties at room temperature is very challenging due to their antagonistic electronic requirements and the need to maintain long range magnetic ordering to such high temperatures. We have demonstrated a new route to such materials, first by engineering competitive ferroelectric performance in a Bi-based perovskite by creating a PZT-like morphotropic phase boundary in the solid solution [1-x] BiFe_2/8Mg_3/8Ti_3/8O₃ - [x]CaTiO₃ (0 < x < 0.40); and then introducing long range magnetic order to this ferroelectric platform by increasing the concentration of Fe³⁺ above the threshold required for a percolating superexchange network. The resulting materials are magnetoelectric, ferromagnetic and ferroelectric above 300 K.