Dynamics of localized modes in a composite multiferroic chain

TL;DR

This paper investigates the behavior of localized magnetic and ferroelectric modes in a composite multiferroic chain, revealing threshold-dependent transmission and noise-assisted energy transfer, advancing potential logic device applications.

Contribution

It demonstrates the conditions for transparent propagation of localized modes across ferroelectric-ferromagnetic interfaces and the influence of noise, which is a novel insight for multiferroic dynamics.

Findings

Threshold amplitude determines mode transmission

Noise can facilitate energy transfer near the threshold

Localized modes can penetrate the ferromagnetic array under specific conditions

Abstract

In a coupled ferroelectric/ferromagnetic system, i.e. a composite multiferroic, the propagation of magnetic or ferroelectric excitations across the whole structure is a key issue for applications. Of a special interest is the dynamics of localized magnetic or ferroelectric modes (LM) across the ferroelectric-ferromagnetic interface, particularly when the LM's carrier frequency is in the band of the ferroelectric and in the band gap of the ferromagnet. For a proper choice of the system's parameters, we find that there is a threshold amplitude above which the interface becomes transparent and a band gap ferroelectric LM penetrates the ferromagnetic array. Below that threshold, the LM is fully reflected. Slightly below this transmission threshold, the addition of noise may lead to energy transmission, provided that the noise level is not too low nor too high, an effect that resembles stochastic resonance. These findings represent an important step towards the application of ferroelectric and/or ferromagnetic LM-based logic.