Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 17: Ferroics - Domains, Domain Walls and Skyrmions IV
DF 17.8: Vortrag
Donnerstag, 23. März 2017, 11:45–12:00, WIL B321
The effect of strain on the magnetic and ferroelectric properties of orthorhombic TbMnO3 — •Amadé Bortis1, Natalya Fedorova2, Alessandro Vindigni3, Andrea Scaramucci2, and Nicola Spaldin2 — 1Laboratory for Multifunctional Ferroic Materials (M. Fiebig), Departement of Materials, ETH Zurich, Switzerland — 2Materials Theory, Departement of Materials, ETH Zurich, Switzerland — 3Microstructure Research, Departement of Physics, ETH Zurich, Switzerland
We model the effect of strain on magnetic and ferroelectric properties of orthorhombic TbMnO3 using ab initio electronic structure calculations and Monte-Carlo simulations. TbMnO3 is a magnetoelectric multiferroic, where the ferroelectricity is triggered by the magnetic ordering, which allows manipulating the electric polarization by a change in the magnetic order. It was shown experimentally that bulk samples of TbMnO3, at low temperature, show a spiral magnetic order, which drives a weak polarization. Recent experiments showed that by applying strain one can change the magnetic order to E-AFM, which leads to a higher polarization. In order to understand the transition from spiral to E-AFM order, we perform ab initio calculations to extract the relevant exchange couplings for a bulk and strained sample, and we use these couplings to perform Monte-Carlo simulations to find the corresponding ground state spin configuration. This allows the determination of the magnetic order and the investigation of its effect on the polarization. We found that applying strain can drive the transition from spiral to E-AFM ordering and can enhance the polarization.