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Rozanov K.N.,Institute for Theoretical and Applied Electromagnetics | Koledintseva M.Y.,Oracle Inc.
Journal of Applied Physics | Year: 2016

Generalized Snoek's law proposed in an integral form by Acher and coauthors is a useful tool for investigation of high-frequency properties of magnetic materials. This integral law referred to as Acher's law allows for evaluating the ultimate performance of RF and microwave devices which employ magnetic materials. It may also be helpful in obtaining useful information on the structure and morphology of the materials. The key factor in practical application of Acher's law is an opportunity to employ either measured or calculated data available over a finite frequency range. The paper uses simple calculations to check the applicability of Acher's law in cases when the frequency range is limited and the magnetic loss peak is comparatively wide and has a distorted shape. The cases of large magnetic damping, pronounced skin effect, and inhomogeneity of the material are considered. It is shown that in most cases calculation of the integral through fitting of actual magnetic frequency dispersion by the Lorentzian dispersion law results in accurate estimations of the ultimate high-frequency performance of magnetic materials. © 2016 AIP Publishing LLC. Source


Liu L.,CAS Shenzhen Institutes of Advanced Technology | Rozanov K.N.,Institute for Theoretical and Applied Electromagnetics | Abshinova M.,National University of Singapore
Applied Physics A: Materials Science and Processing | Year: 2013

Tunable electromagnetic properties (permeability and permittivity) of composites filled with glass-coated microwires under external magnetic field were investigated experimentally. The microwire composites have been measured with 7 mm coaxial airline fixture and vector network analyzer from 0.01 to 18 GHz. The ferromagnetic resonance may contribute to the tunability of permeability of microwire composites. The tunability of effective dielectric permittivity may be attributed to the magnetoimpedance effect. The microwire composites are promising candidates for smart or tunable applications at microwave frequency. © 2012 Springer-Verlag Berlin Heidelberg. Source


Baryshev A.V.,Toyohashi University of Technology | Baryshev A.V.,RAS Ioffe Physical - Technical Institute | Merzlikin A.M.,Toyohashi University of Technology | Merzlikin A.M.,Institute for Theoretical and Applied Electromagnetics | Inoue M.,Toyohashi University of Technology
Journal of Physics D: Applied Physics | Year: 2013

A one-dimensional photonic crystal with termination by a noble metal film - a plasmonic photonic-crystal slab - is theoretically analysed for its optical response at the variation of the dielectric permittivity of an analyte. A sharp attenuation peak associated with a 'noble metal-visualized' Bloch surface wave is observed due to plasmon absorption in the metal. We investigate the sensing performance of the slab and show that it is tolerant to the variation of probing conditions and the slab's structural parameters. As a consequence, the considered sensor exhibits an enhanced sensitivity and good robustness in comparison with conventional surface-plasmon and Bloch surface wave sensors. © 2013 IOP Publishing Ltd. Source


Baryshev A.V.,Toyohashi University of Technology | Baryshev A.V.,RAS Ioffe Physical - Technical Institute | Merzlikin A.M.,Institute for Theoretical and Applied Electromagnetics
Applied Optics | Year: 2014

The Bloch surface wave resonance (SWR) was visualized with the aid of plasmon absorption in a dielectric/metal/dielectric sandwich terminating a one-dimensional photonic crystal (PhC). An SWR peak in calculated spectra of such a plasmonic photonic crystal (PPhC) slab comprising a noble or base metal layer was demonstrated to be sensitive to a negligible variation of refractive index of a medium adjoining to the slab. The considered structure of PPhC slabs can be of practical importance because the metal layer is protected by a capping dielectric layer from contact with analytes and, consequently, from deterioration. We found that, in case of PPhC slabs, gold (the key element of the surface plasmon resonance-based biosensors) can be replaced by other metals. The PPhC-based sensors can be low-cost, reusable, and robust sensors having a sensitivity surpassing that of the known optical sensors. © 2014 Optical Society of America. Source


Rozanov K.N.,Institute for Theoretical and Applied Electromagnetics | Koledintseva M.Y.,Missouri University of Science and Technology
IEEE International Symposium on Electromagnetic Compatibility | Year: 2012

Electromagnetic materials applied to solve various EMC and EMI problems require adequate analytical description of their RF and microwave material parameters. This is necessary for numerical optimization of wideband electromagnetic performance of devices incorporating these materials. The paper discusses the shape of frequency dependences of microwave permeability in homogeneous materials and composites. The Lorentzian frequency dispersion law is shown to allow for rather accurate description of all types of magnetic loss peaks, including those related to the ferromagnetic resonance and the effect of eddy currents. To model wideband electromagnetic performance of composites, mixing laws are typically used. The problem is which mixing law is to be chosen to adequately describe a particular composite. The paper gives recommendations on how to make the choice of a proper mixing rule. © 2012 IEEE. Source

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