Abstract
Introduction. The distinctive feature of a coplanar transmission line with thin ferrite and ferroelectric films is the absence of undesirable irregularities in dispersion for relatively low frequencies when the wavelength approaches the thickness of ferroelectric layer, in contrast to the open ferrite-ferroelectric wave-guiding structure without metallization. Aim. The purpose of this paper is twofold: (i) to develop a theory of the wave spectra in the multiferroic structures based on the coplanar lines; (ii) using this theory to find ways to enhance the electric tuning range. Materials and methods . The dispersion relation for spin-electromagnetic waves was derived through analytical solution of the full set of the Maxwell's equations utilizing a method of approximate boundary conditions. Results. A theory of spin-electromagnetic wave spectrum has been developed for the thin-film ferrite-ferroelectric structure based on a coplanar transmission line. According to this theory, dispersion characteristics of the spin-electromagnetic waves were described and analyzed for different parameters of the structure. The obtained results show that the investigated structure demonstrates a dual electric and magnetic field tunability of wave spectra. Its efficiency increases with an increase in the thicknesses of the ferrite and ferroelectric films and with a decrease in the width of the central metal strip. Conclusion. The distinctive features of the proposed coplanar waveguides are the thin-film planar topology and dual tunability of the wave spectra. All these advantages make the proposed structures perspective for development of new microwave devices.
Highlights
The distinctive feature of a coplanar transmission line with thin ferrite and ferroelectric films is the absence of undesirable irregularities in dispersion for relatively low frequencies when the wavelength approaches the thickness of ferroelectric layer, in contrast to the open ferrite-ferroelectric wave-guiding structure without metallization
An interaction between the ferromagnetic and ferroelectric phases is realized through the electrodynamic coupling of the microwave spin waves (SW) and electromagnetic waves (EMW)
The SEWs are originated from the electrodynamic coupling of the EMW propagating in a slot or a coplanar transmission line (TL), with the SW existing in the ferrite film
Summary
Recent advances made in the area of thin film deposition techniques have resulted in the application of the multilayered multiferroic structures that combine advantages of ferrite and ferroelectric materials. The second family is the layered structures consisting of thin magnetic and ferroelectric films combined with a slot or a coplanar microwave transmission line (TL) [14, 26, 27]. In the latter case, the SEWs are originated from the electrodynamic coupling of the EMW propagating in a slot or a coplanar TL, with the SW existing in the ferrite film. – the solution of the boundary-value problem will be reduced to the derivation of the dispersion equation for a symmetrical rectangular waveguide loaded with a coplanar TL surrounded by perfectly conducting metal walls (Fig. 1) This approach is physically applicable because the electric and mag-. Where X11 , X12 , X 21 , X 22 are the same elements of matrix X as for the structure with slot transmission line (see [28]), z1 1,n, m, s 1 1 m s J2s qn
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
