Excitation of spin waves in superconducting ferromagnets

This Letter presents a theoretical analysis of propagation of spin waves in a superconducting ferromagnet. The surface impedance was calculated for the case when the magnetization is normal to the sample surface. We found the frequencies at which the impedance and the power absorption have singularities related to the spin-wave propagation, and determined the form of these singularities. With a suitable choice of parameters, there is a frequency interval in which two propagating spin waves of the same circular polarization are generated, one of them having a negative group velocity.     

Propagation of electromagnetic waves in two-dimensionally periodic thin-film waveguides

A simplified mathematical model of two-dimensionally(2D) periodic thin-film wavegmide is proposed and the characteristics of wave propagation are shown to be governed by a five-term recurrence relation with dyadic admittance coefficients. The generalized transverse resonance method can be used to analyze any complicated 2D periodic thin-film waveguide. The dispersion characteristics are described by both approximation analysis and numerical calculation. The theoretical explanation and physical understanding of the effecis of 2D periodic modulation provided by our analysis and resulis can give sound support to the engineering applications.     

Electromagnetic waves in dielectrics with memory

We analyse electromagnetic wave propagation in a dielectric with memory of the Maxwell-Hopkinson type. We show that the components of the electric and magnetic fields satisfy two different scalar wave equations and we first look for their harmonic plane wave solutions. Then we prove that dielectrics with memory can also support approximate Courant-Hilbert waves. We discuss the equations to be solved to get all the components of the electromagnetic field from a scalar solution from each wave equation and TE, TM harmonic plane waves are explicitly given.     

Electrophysics of nanocluster thin-film systems: Achieving superconducting topological states

The possibility of controlling the functional properties of nanostructured thin films deposited on solid substrates using lasers stems from the different topology and elemental composition of the deposited materials. Quantum-correlated states that emerge in the deposited granular nanocluster semiconductor/ metal structures lead to hopping/tunneling conductivity. The possibility of high-temperature superconductivity in such nanocluster structures that are both stable and can give rise to different (nonphonon) electron pairing mechanisms is discussed. An increase in electrical conductivity (by several orders of magnitude) is observed in experiments, depending on the surface and boundary conditions in various topologically organized cluster systems. The problem is to find the optimum numerical relations between the topological parameters in order to obtain the patterns of directivity (such as the Bragg resonance) needed for a sharp increase in electrical conductivity in selective directions.     

Parametric interaction of space-charge waves in thin-film semiconductor structures

The general theory of parametric coupling between space-charge waves and drifting charge carriers in thin-film semiconductor structures has been worked out. This theory is applicable, in particular, to n-GaAs and n-InP semiconductors with negative differential conductance due to intervalley electron transitions under high electric fields. We started from the electrodynamic theory of waveguide excitation by extraneous currents, which was extended for arbitrary waveguide structures with composite active media. Our theory makes it possible to study parametric interaction between space-charge waves in semiconductor films with regard for boundary conditions, diffusion, the anisotropy and the frequency dispersion of the differential electron mobility, as well as the multifrequency and multimode nature of a wave process in thin-film structures.     

ITER超导磁体线圈电磁分析

ITER装置CS线圈、PF线圈、TF线圈是ITER装置超导磁体系统的重要组成部分.电磁性能是超导磁体重要的方面,在研制时对各个线圈的电磁分析是十分重要的.文中通过PRO/E建立模型用Ansys软件,对ITER导体的线圈在其最大工作电流下进行有限元分析,分析的模型分别为:只有CS线圈与PF线圈二维模型;单独TF线圈三维模...     

Electromagnetic detector for gravitational waves

We analyze the mode of operation of a two-level parametric electromagnetic detector for gravitational waves which is tunable and potentially more sensitive than the mechanical antennas currently considered.     

Electromagnetic waves in isotropic and gyrotropic media

Maxwell’s equations are considered for waves in transparent inhomogeneous anisotropic and gyrotropic media with time dispersion. A uniaxial inhomogeneous crystal is taken for an anisotropic medium and an isotropic heterogeneous medium in a constant electric field for a gyrotropic medium. The solutions for flat-layered and cylindrical media are presented in terms of Hertz potentials. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 82–86, March, 2008.     

Electromagnetic waves in a magnetoactive fluctuating plasma

Radiophysics and Electronics Institute, Academy of Sciences of the USSR. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 32, No. 1, pp. 27–33, January, 1989.     

Electromagnetic waves in a plane wave background

Source-free Maxwell equations are equivalent to the scalar wave equation. Most of its solutions are singular at infinity. If the nail eigenvector of the background metric is an eigenvector of the Maxwell field, too, the e.m. field is not changed by the plane wave.     

Solitary electromagnetic waves in nonlinear lines

The results are given of an investigation of solitary electromagnetic waves in a nonlinear transmission line with semiconductor diodes. An experimental study is made of the processes of formation, propagation, and interaction of solitary waves.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 15, No. 4, pp. 580–591, April, 1972.The authors thank V. A. Aksenov and Yu. G. Khabibullina for their help in performing the experiments.