Coupled dynamics of polarization and magnetization in ferroelectric-magnetic layers
Final Report Abstract
The project is focused on novel materials - two phase multiferroics, exhibiting coupled ferroelectric and ferromagnetic orders. Aiming at developing a numerical method to couple the magnetization dynamics based on the Landau-Lifhitz-Gilbert equation with the polarization dynamics using the Landau-Khalatnikov equation as well as using Monte-Carlo methods, peculiarities of the switching behavior of ferroelectric and ferromagnetic orders were demonstrated depending on the type of the coupling between the orders. In particular, using as a prototype structure an interface of Fe/BaTiO3, where a strong charge-mediated magneto electric coupling has been evidenced, it was shown that though the subsystems are coupled, the ferroelectric subsystem responses to an external time-dependent electric field on the time scale of several picoseconds, whereas the magnetic subsystem requires up to several hundreds of picoseconds to be fully switched. The effect of the strain-mediated coupling was separately inspected for the same interface, where an externally applied time-dependent electric field caused an interfacial stress of the ferroelectric and resulted in a modified anisotropy of the ferromagnet modifying thus the magnetization. Additionally, within the present calculations the effect of ferromagnetic resonance for Fe/BaTiO3-interface was demonstrated to reveal the strength and the symmetry of the magnetoelectric coupling, which was corroborated in a subsequent experiment. The proposed methods clarified the role of thermal fluctuations in two-phase multiferroics and rendered possible a demonstration of multiferroic systems for signal handling processes.
Publications
- ”Influence of magnetoelectric coupling on electric field induced magnetization reversal in a composite unstrained multiferroic chain”, Physical Review B 85, 054401 (2012)
P.P. Horley, A. Sukhov, C.-L. Jia, E. Martinez, J. Berakdar
(See online at https://doi.org/10.1103/PhysRevB.85.054401) - ”Piezoelectric control of the magnetic anisotropy via interface strain coupling in a composite multiferroic chain”, European Physical Letters 99, 17004 (2012)
C.-L. Jia, A. Sukhov, P.P. Horley, J. Berakdar
(See online at https://doi.org/10.1209/0295-5075/99/17004) - ”Dynamics of localized modes in a composite multiferroic chain”, Physical Review Letters 111, 117202 (2013)
L. Chotorlishvili, R. Khomeriki, A. Sukhov, S. Ruffo, J. Berakdar
(See online at https://doi.org/10.1103/PhysRevLett.111.117202) - ”Magnetoelectric coupling in a ferroelectric/ferromagnetic chain revealed by ferromagnetic resonance”, Journal of Applied Physics 113, 013908 (2013)
A. Sukhov, P.P. Horley, C.-L. Jia, J. Berakdar
(See online at https://doi.org/10.1063/1.4772746) - ”Theoretical proposal for the dynamical control of the nonlinear optical repsonse frequency”, Fluctuations and Noise Letters 12, 1350003 (2013)
L. Chotorlishvili, A. Sukhov, S. Wimberger, J. Berakdar
(See online at https://doi.org/10.1142/S021947751350003X) - ”Thermally activated in-plane magnetization rotation induced by spin torque”, Journal of Applied Physics 114, 123906 (2013)
L. Chotorlishvili, Z. Toklishvili, A. Sukhov, P.P. Horley, V.K. Dugaev, V.R. Vieira, S. Trimper, J. Berakdar
(See online at https://doi.org/10.1063/1.4822058) - ”Angular dependence of ferromagnetic resonance as indicator of the nature of magnetoelectric coupling in ferromagnetic-ferroelectric heterostructures”, Physical Review B 90, 22428 (2014)
A. Sukhov, C.-L. Jia, L. Chotorlishvili, P.P. Horley, D. Sander, J. Berakdar
(See online at https://doi.org/10.1103/PhysRevB.90.224428) - ”Dipole-dipole interaction in arrays of Fe/Fex Oy core/shell nanocubes probed by ferromagnetic resonance”, IEEE Transactions on Magnetics 50, 1301209 (2014)
A. Sukhov, P.P. Horley, J. Berakdar, A. Terwey, R. Mecknestock, M. Farle
(See online at https://doi.org/10.1109/TMAG.2014.2329814) - ”Finite-size effects on the magnetoelectric coupling in a ferroelectric/ferromagnetic structure revealed by ferromagnetic resonance”, European Physical Journal Web of Conferences 75, 09001 (2014)
A. Sukhov, P.P. Horley, C.-L. Jia, L. Chotorlishvili, J. Berakdar
(See online at https://doi.org/10.1051/epjconf/20147509001) - ”On the superparamagnetic size limit of nanoparticles on a ferroelectric substrate”, Journal of Physics D: Applied Physics 47, 155302 (2014)
A. Sukhov, L. Chotorlishvili, P.P. Horley, C.-L. Jia, S.-K. Mishra, J. Berakdar
(See online at https://doi.org/10.1088/0022-3727/47/15/155302)
