Characteristics of magneto-static surface wave propagating in layered ferrimagnetic structure with a slightly absorptive superstrate

Abstract

The paper describes the theoretical and experimental stud,y on the magneto-static surface wave (MSSW) propagating in a layered ferrimagnetic structure, onto which a slightly lossy material such as an electrolyte is covered. We focused on the propagation characteristics of the MSSW; especially, the attenuation of the MSSW, due to the cover material's conductivity. With the complete electromagnetic theory, the dispersion characteristics of the MSSW was derived. The theoretical ainalysis was compared with the preliminary experiment using the sodium chloride dissolved in water as a superstrate, the result of which was in a good agreement. This indicates the application of the considered structure to the electrolyte densitoimeter using the fact that the conductivity is in proportion to the content of the electrolyte.

Nonreciprocal dispersion of spin waves in ferromagnetic thin films covered with a finite-conductivity metal

“…24 Other propagation and field configurations 25,26 and more complex structures, such as multilayer systems 27,28 and MCs in contact with a perfect electrical conductor, have been studied as well. 4,29 The dispersion of SWs in thin-film structures can be measured by different experimental techniques, in transmission with the use of microwave antennas 2 (also in magnetic structures in contact with a metal 3,21,22 ) or, since recently, by Brillouin light scattering (BLS). 30,31 The resolution of the BLS technique has proved adequate for the study of nanosize films, with a k step of the order of 0.5 × 10 6 1/m.…”

“…The analytical solutions for the SW frequencies f are more complicated; numerical solutions can be obtained, though. [21][22][23] The finite-difference time-domain method has been used for studying the broadband ferromagnetic resonance response of single-layer and bi-layer magnetic films in contact with a metal. 24 Other propagation and field configurations 25,26 and more complex structures, such as multilayer systems 27,28 and MCs in contact with a perfect electrical conductor, have been studied as well.…”