On the nonlinear dynamics of electro-magnon excitations in the BaTiO₃/Fe nanostructured multiferroic composite material

¹ Pure Physics Laboratory: Group of Nonlinear Physics and Complex Systems, Department of Physics, Faculty of Science, University of Douala - P.O. Box 24157 Douala, Cameroon
² National Committee for Technology Development (CNDT), Ministry of Scientific Research and Innovation P.O. Box 1457 Yaounde, Cameroon
³ The Abdus Salam ICTP - Strada Costiera 11, I-34151 Trieste, Italy
⁴ SISSA - Via Bonomea 265, I-34136 Trieste, Italy
⁵ INFN, Sezione di Trieste - I-34151 Trieste, Italy
⁶ Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche - Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy

Received: 29 April 2018
Accepted: 2 July 2018

Abstract

We study the motion of an electric excitation between the ferroelectric (FE) and the ferromagnetic (FM) components of a MultiFerroic (MF) composite material by analysing the transfer of energy from the FE side to the FM one. The transmission process of the electric excitation, which has an envelope soliton shape, is studied for a one-dimensional model of the barium titanate/iron (BaTiO₃/Fe) composite. From the transmission spectrum, we determine the most favourable range of the values of the amplitude and of the width of the initial excitation for the transmission of the FE energy to the FM part of the MF material. From the numerical analysis, it is shown that the position in which we excite the FE component strongly impacts on the solitary wave dynamics. We have also realised that, for some initial positions and suitable range of values of the amplitude and width of the excitation of the polarization, we get a stationary localised magnetic excitation in the FM part of the MF material that lasts for a long time. Such a phenomenon, which originates from a curvilinear trajectory of the incoming excitation is promising enough for the implementation of non-volatile memories based on MF composite materials.