Volume 92, Number 1, October 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||02 November 2010|
Mechanisms of magnetoelectricity in manganese-doped incipient ferroelectrics
Institute for Problems of Materials Science NASU - Krzhizhanovskogo 3, 03180 Kiev, Ukraine
2 Institute of Physics, AS CR - Cukrovarnicka 10, 16253 Prague, Czech Republic, EU
3 Aix-Marseille Université, IM2NP CNRS - FST St-Jérôme - Avenue Escadrille Normandie Niemen, F-13397, Marseille Cedex, France, EU
4 IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Science of University of Porto - Rua do Campo Alegre, 687, 4169-007 Porto, Portugal, EU
5 Department of Ceramics and Glass Engineering, CICECO, University of Aveiro - 3810-193 Aveiro, Portugal, EU
Accepted: 22 September 2010
We report magnetization measurements and magnetic resonance data for SrTiO3 doped by manganese. We show that the recently reported coexistent spin and dipole glass (multiglass) behaviours are strongly affected by the distribution of Mn ions between the Sr and Ti sites. Motivated by this finding we calculate the magnetic interactions between Mn impurities of different kinds. Both LSDA+U and many-body perturbation theory evidence that magnetic and magnetoelectric interactions are mediated by MnB4+ ions substituting for Ti. We propose two microscopic magnetoelectric coupling mechanisms, which can be involved in all magnetoelectric systems based on incipient ferroelectrics. In the first one, the electric field modifies the spin susceptibility via spin-strain coupling of MnB4+. The second mechanism concerns Mn pairs coupled by the position-dependent exchange interaction.
PACS: 75.85.+t – Magnetoelectric effects, multiferroics / 75.30.Hx – Magnetic impurity interactions / 76.30.Fc – Iron group (3d) ions and impurities (Ti-Cu)
© EPLA, 2010
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