Magnetic states and hyperfine interactions in magnetic superlattices Fe/ Al
Magnetic states and hyperfine interactions in magnetic superlattices Fe/ Al
S.D. Antipov, G.E. Goryunov, A.L. Kolumbaev, G.V. Smirnitskaya, and P.N. Stetsenko
Multilayer Fe/ Al films were synthesized Ьу cathode discharge sputtering with oscillating electrons. The Fe layers were about 6 А thick, the Al layers were 6 to 95 А thick, and the number of layers varied from 250 to 830. The behavior of Fe atoms in the superlattices was studied Ьу the methods of radiographic analysis, magnetic measurements of main magnetic characteristics, 57Fe Mossbauer spectroscopy, and magnetic phase analysis.
Show AbstractА new method of determination of photoelectric parameters of semiconductor wafers with p-n junctions
А new method of determination of photoelectric parameters of semiconductor wafers with p-n junctions
0.G. Koshelev and V.A. Morozova
А new method has been proposed for the determination of the diffusion length and lifetime of minority carriers in wafers with p-n junctions. Nonequilibrium carriers are excited Ьу two light beams modulated Ьу а single frequency, one of which is absorbed heavily and the other one readily. The conditions of modulation of these beams are chosen such that the total а.с. voltage across the p-n junction vanishes. The diffusion length is determined from the ratio of light beam intensities and the lifetime is determined from the frequency dependence of this ratio or from the phase shift between the modulations. The numerical computations showed that the method can bе applied to silicon solar cells. The advantages of the method are discussed.
Show AbstractFrequency dependence of impurity conduction in а quantum well
Frequency dependence of impurity conduction in а quantum well
I.Р. Zvyagin and W. Wang
А frequency dependence has been found of the phonon contribution to а.с. hopping conductivity associated with transitions between impurity electronic states in а quantum well. It is shown that the transverse electric field may lead to а significant decrease in conductivity.
Show AbstractPhenomenological model of isomorphic phase transitions in thin ferroelectric films
Phenomenological model of isomorphic phase transitions in thin ferroelectric films
S.V. Pavlov and M.L. Akimov
А phenomenological model of isomorphic phase transitions in thin ferroelectric films has been considered taking into account spatial inhomogeneity and size effects. The solution of the boundary value proЫem Ьу numerical methods enaЬled us to conclude that size effects and inhomogeneity of ferroelectrics do not suppress isomorphic phase transitions, whose observation in thin ferroelectric films is in principle possiЫe.
Show AbstractAbout day length variations and atmospheric circulation oscillations
About day length variations and atmospheric circulation oscillations
V.E. Zharov
А comparison of the spectra of the day length and of the axial component of the atmospheric angular momentum reveals an appreciaЫe influence of atmospheric turbulence on the Earth's rotation. Day length variations with periods from several days to four months are determined Ьу turbulence. It has been shown that the periods of the majority of harmonics are close to the periods of natural atmospheric oscillations caused Ьу variations of the latitudinal temperature difference.
Show AbstractBrief communications clausius virial theorem and scale relations in the method of many-particle density functionals
Brief communications clausius virial theorem and scale relations in the method of many-particle density functionals
0.S. Erkovich
Scale relations that appear in applying the method of many-particle density functionals are considered. Scale transformation is applied to oЬtain the relations for the kinetic energy functionals and for the potential energy of interparticle interactions and for the interactions of particles with an external field for the ground states of the systems of charged particles in а pure Coulomb field. The Clausius virial theorem for the method of many-particle density functionals has been formulated.
Show AbstractEvolution of spectra of acoustic wave packets in a nonlinear dissipative medium
Evolution of spectra of acoustic wave packets in a nonlinear dissipative medium
А.А. Sukhorukov
Тransformation of spectra of acoustic signals of N- and S- types, that contain several oscillations of pressure, in а nonlinear viscous medium for different laws of the field decay at the pulse tails is considered. Dynamics of spectra in the process of formation of Ьipolar pulses, described Ьу self-similar solutions of the linearized or complete Burgers equation, is observed.
Show AbstractDependence of magneto-optical effect on magnetic wedge thickness in Au/Co-wedge/Au (001) sandwiches
Dependence of magneto-optical effect on magnetic wedge thickness in Au/Co-wedge/Au (001) sandwiches
E.Е. Shalygina, A.V. Vedyayev, А. Marty, В. Gilles, M.V. Lazarev, and О.А. Shalygina
This paper describes the results of investigations of the magnetic and magnetooptical properties of Au/Co-wedge/ Au {001} sandwiches. It was found that the transverse Kerr effect (ТКЕ) undergoes oscillations with а change of the thickness of the Co-wedge from О to 20 А. It has been established that the period of these oscillations is Т 4-5 А. The value of Т has been found to depend on the quantum energy of incident light. It has been proved that the oscillations of the ТКЕ are caused bу quantum size effects.
Show AbstractAbout the vortex-wave structure of density current
About the vortex-wave structure of density current
B.I. Samolyubov and V.V. Kremenetskii
Тransformations in the structure of bottom density current under the effect of vortex-wave processes are analyzed. Quasi-stationary, wave, and vortex components of the velocity profile are distinguished. А variance ratio for the internal wave in the suspension-stratified current is obtained. Vortex-like disturbances in the velocity are revealed. А procedure for analytical description of the flow velocity profile with allowance for the effect of vortex-wave processes is developed and tested Ьу using full scale measuring data.
Show AbstractOn some formulations of the problem of thermoelectric cooling
On some formulations of the problem of thermoelectric cooling
V.В. Glasko, Yu.V. Glasko, and А.V. Shchepetilov
Two new mathematical formulations of the proЬlem of thermoelectric cooling have been considered in the framework of а known thermodynamic model of the Peltier effect. The solution algorithms of these formulations have been realized in computer programs. The results of а mathematical experiment have been presented.
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