Berlin 2012 – scientific programme
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DS: Fachverband Dünne Schichten
DS 9: Multiferroics I: Junctions and thin films / Magnetoelectric coupling (jointly with MA, DF, KR, TT)
DS 9.6: Talk
Monday, March 26, 2012, 11:15–11:30, EB 301
Guest molecules in ABX3 metal-organic frameworks: multiferroicity and magnetoelectricity — •Alessandro Stroppa1, Prashant Jain2, Paolo Barone1, Martijn Marsman3, Juan Manuel Perez-Mato4, Anthony K. Cheetham5, Harold W. Kroto2, and Silvia Picozzi1 — 1CNR-SPIN, L'Aquila, Italy — 2Department of Chemistry and Biochemistry, Florida State University Tallahassee, FL 32306 (USA) — 3University of Vienna, Faculty of Physics and Center for Computational Materials Science (Austria) — 4Departamento de Fisica de la Materia Condensada Facultad de Ciencia y Tecnologia, UPV/EHU, Bilbao (Spain) — 5Department of Materials Science and Metallurgy University of Cambridge (UK)
Metal-organic frameworks (MOFs) are increasingly regarded as promising materials. MOFs with perovskite architecture have recently branched out into the field of multiferroics, materials which have both magnetic and ferroelectric orders. Here, we focus on a MOF compound and theoretically show that it is ferroelectric and this ferroelectricity is the cause of a weak ferromagnetic coupling. In inorganic perovskite-like compounds, octahedral tilting and Jahn-Teller distortions are usually non-polar modes. In this MOF, however, their cooperative link to A-groups via hydrogen bondings finally breaks inversion symmetry, and induces a ferroelectric polarization. We show that the switching of polarization direction implies the reversal of the weak ferromagnetic component, therefore allowing the long-sought electrical control of the magnetization.