Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 12: Multiferroics and magnetoelectrics II (joint session MA/KFM)
KFM 12.4: Vortrag
Mittwoch, 14. März 2018, 10:15–10:30, EB 202
Domain wall engineering as a route towards room temperature multiferroicity — •Konstantin Z. Rushchanskii, Stefan Blügel, and Marjana Ležaić — Peter Grünberg Institut, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
Multiferroics are materials that exhibit two or more ferroic order parameters in a single phase. Their room-temperature functionality as well as the strong coupling of magnetic and electric order parameters are desired for devices of future electronics, such as multistate non-volatile memory cells, electrically controlled spintronic devices, etc. Isostructural Ga0.6Fe1.4O3 (GFO) [1] and є-Fe2O3 (eFO) [2] are of special interest, due to simultaneous presence of ferrimagnetic coupling and a polar structure. Recently reported observation of room-temperature mutiferroic behavior in thin films of these compounds made them prospective materials for practical applications. Unfortunately, ferroelectric properties were experimentally observed only for a limited number of samples, and the conditions to have switchable polarization are still unclear.
We employ Density Functional Theory in combination with an evolutionary algorithm [3] to obtain realistic models of polarization switching in eFO and GFO. We will discuss the conditions, under which the films with maximal, switchable remanent ferroelectric polarization are obtained.
We acknowledge the support by GALIMEO Consortium.
[1] A. Thomasson et al., J. Appl. Phys. 113, 214101 (2013); [2] M. Gich et al., Adv. Mater., 26, 4645 (2014); [3] http://uspex.stonybrook.edu