Berlin 2012 – wissenschaftliches Programm

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KR: Fachgruppe Kristallographie

KR 2: Joint Session "Multiferroics I - Junctions and Thin Films / Magnetoelectric Coupling" (MA jointly with DF, DS, KR, TT), Organization: Manfred Fiebig (ETH Zürich)

KR 2.7: Vortrag

Montag, 26. März 2012, 11:30–11:45, EB 301

magnetoelectric effects in the cubic ferrimagnet Cu₂OSeO₃ — •Maria Eleni Belesi^1,2, Mohamed Abid¹, Helmuth Berger¹, and Jean-Philippe Ansermet¹ — ¹Institute of Condensed Matter Physics, EPFL, Station 3, CH-1015 Lausanne, Switzerland — ²Leibniz Institute for Solid State and Materials Research, Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany

We present magnetic and dielectric measurements in single crystals of the cubic magnetoelectric compound Cu₂OSeO₃. The magnetic measurements show a transition to a ferrimagnetic state at 60 K. This state shows a finite magnetocapacitance which is temperature dependent and varies significantly upon changing the direction of the magnetic field with respect to the crystallographic axes. The magnetocapacitance is also shown to vary with the relative orientation of the magnetic and electric fields. In addition, we found that the magnetically ordered state shows a magnetic field induced electric polarization, whose temperature dependence and anisotropic properties will be discussed.