Frequency dependence of magneto-optical phenomena in nonmagnetic dielectric nanostructures

This article presents the results of experimental studies on the formation of nanosized objects in single crystals of silicon ion-implanted with manganese ions with an energy of 40 keV at various doses. The formation of nanosized objects was determined by atomic force microscopy (AFM) and Raman spectroscopy (RS). It was found that in the Raman spectrum of non-implanted samples there are peaks with a wave number of 520 cm-1 characteristic of pure silicon associated with the crystalline phase and satellites with frequencies 301 cm-1, and 971 cm-1. The band with a wave number of 971 cm-1 corresponds to the main band of the tetrahedral bond in silicon. The intensity of this peak depends on the sample thickness. When the sample thickness changes from 200 μm to 3 mm, the intensity of this peak decreases by almost two times. And in the Raman spectra of ion-implanted samples, several bands with different intensities are observed, and their number and intensity strongly depend on the implantation dose. It has been suggested that the observed peaks are possibly associated with radiation defects and nanosized formations. This assumption was verified using AFM investigation. The AFM images show various nanosized objects, apparently associated with manganese ions.

Section: Discussion Of Resultssupporting

confidence: 66%

Investigations of the formation of nanosized objects in manganese implanted silicon single crystals by the methods of Raman scattering of light and atomic force microscopy

Arzikulov,

Salakhitdinov,

Kholmurodov

et al. 2023

“…The basic equations for a non-stationary flow of natural air convection using the law of conservation of mass, momentum, energy in the Boussinesq approximation can be written as [8,9]:…”

Section: Methodsmentioning

confidence: 99%

Simulation of natural convection in a solar collector

Jumaev,

Kodirov,

Mirzaev

2023

The process of natural convection in a flat solar collector, which was designed by the authors, was mathematically modeled using experimental data. Stones were used as storage means. The inclined collector is expressed as a two-dimensional plate for modeling. The initial and boundary conditions were formulated. It was assumed that the flow in this region is laminar. To simulate the flow of natural air convection, a system of non-stationary partial differential equations was chosen based on the laws of conservation of mass, momentum and energy in the Boussinesq approximation. The equations were solved in a dimensionless form using the finite difference method and an explicit scheme. The picture of the temperature fields and the appearance of convection was obtained on the basis of experimental temperature data in the inlet and outlet zones of the collector, as well as on the surface of the heat accumulator during the day. To evaluate the effectiveness of the resulting model an average approximation error (approximation) of 7.7% was established. The results obtained in specific values of the Grashof and Prandtl numbers are presented in the form of graphs.

“…Recently, one of the intensively developed areas of femtomagnetism is the control of the magnetization of nano-sized magnets, and also the speed of ultrafast laser-induced spin precession with spin-orbit interaction [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Precession of magnetic moments with change of their orientations

Zhumaev,

Sharipov,

Rizokulov

2023

In the work the precession of the magnetization vector in nano-sized magnets is induced by a femtosecond laser pulse, the frequency of which lies in the transparency region of the magnet material. It is shown that an alternating magnetic field applied to the XOY plane generates the magnetic equilibrium position vectors and elliptical precession occurs if a constant magnetic field acts along the Z axis. In this case the precession angle changes periodically in time and the precession frequency is determined by the amplitude of the total magnetic field.