Theory of dual-tunable thin-film multiferroic magnonic crystal

Abstract

A theory has been developed for the waveguiding characteristics of dual-tunable multiferroic magnonic crystals (MCs). The crystals are constructed as periodically width-modulated microwave transmission slot-lines placed in between thin ferrite and ferroelectric films. Dispersion characteristics of the spin-electromagnetic waves (SEWs) in the investigated periodic waveguiding structure were derived using the method of approximate boundary conditions and the coupled-mode approach. The transmission-loss characteristics (TLCs) were calculated by the transfer-matrix method. The results show that the TLCs of the structures consist of pass-bands and stop-bands. The stop-bands are due to Bragg reflections in the structure. The magnetic and electric fields control the stop-band frequencies. The ferroelectric film polarization produced with the application of control voltage to the slot-line electrodes reduces its dielectric permittivity and provides up-shift of the stop-band frequencies. The most effective electric tuning is achieved in the area of the maximum hybridization of SEWs. As a result, the investigated multiferroic MCs combine the advantages of thin-film planar topology and dual tunability of magnonic band-gaps.

Electromagnonic crystals based on ferrite–ferroelectric–ferrite multilayers

“…4 a ). The first and the second waveguiding structures are discussed in detail [5–14, 34–38] while the third one was not investigated. The experimental and theoretical investigations of transmission characteristics of the third waveguiding structure validate the mechanism of the band structure formation when compared with other structures.…”

“…By analogy to natural multiferroic solids, the quanta of these waves are considered as electro‐active magnons or electromagnons. The multiferroic periodical structures, called electromagnonic crystals (EMCs), demonstrate the electrically and magnetically tunable band gaps, where propagation of the electromagnons is forbidden [13, 14, 34–38].…”

Dynamic electromagnonic crystal based on artificial multiferroic heterostructure

“…34,35 .) and the use of thin ferroelectric film with a slot transmission line [36][37][38] the control voltage can be drastically reduced. For example, if we reduce size of the YIG film down to already reported in ref.…”

Perspective: Strong microwave photon-magnon coupling in multiresonant dielectric antennas

“…Another electrical method that may be used to control the photon-magnon coupling consists in exploiting the dual electric and magnetic tunability of the physical properties of multiferroic materials 58,59 . A system realising this control mechanism may consists of a ferrite film hybridised with a ferroelectric film.…”