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
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”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
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”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
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”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
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”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
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”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
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”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
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”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
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”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
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”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
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”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
