Low-frequency radiation of magnetoacoustic solitons in an inhomogeneous magnetic field

Astrophysics ◽  
1984 ◽  
Vol 20 (3) ◽  
pp. 335-339
Author(s):  
R. G. Dzhangiryan ◽  
F. A. Kostanyan
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Inhomogeneous Magnetic Field ◽  
Frequency Radiation

scholarly journals Magnetic Field due to the Radiation of High Altitude Lightning

2020 ◽  
Vol 8 (2S12) ◽  
pp. 49-50
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Radiation ◽  
High Altitude ◽  
Low Frequency ◽  
Frequency Region ◽  
Middle Region ◽  
Very Low Frequency ◽  
Lightning Discharges ◽  
Cloud To Ground Lightning ◽  
Frequency Radiation

High altitude optical discharges generated by extreme cloud-to-ground lightning strokes, which occur in the middle region of the atmosphere known as sprites. Streamer formation in sprites has been well stated to be existing by several previous workers. These streamers are not only responsible for the initiation of sprites but also they are composed of these streamers. It causes the production of electromagnetic radiation upto or below the ELF (very low frequency) region which have been reported earlier through various research theories. Thus, we are reporting out for the formulation of the model by using an earlier model used to estimate higher frequency radiation from cloud and ground lightning discharges through these positive corona streamers. Taking it into account, other terms like radiation magnetic field has been evaluated with the studied observations.

scholarly journals System for detection of the inhomogeneous distribution of magnetic field based on liquid crystals with magnetic nanoparticle

2021 ◽  
Vol 4 (2) ◽  
Keyword(s):  
Magnetic Field ◽  
Liquid Crystals ◽  
Magnetic Nanoparticles ◽  
Low Frequency ◽  
Inhomogeneous Magnetic Field ◽  
Inhomogeneous Distribution ◽  
Frequency Magnetic Field ◽  
Reorientation Time ◽  
Main Component ◽  
To Receive

The main objective of this article is to develop the basic technological principles of production of the magnetosensitive layer based on nematic liquid crystals with magnetic nanoparticles as the main component of the system, which allows obtaining a two-dimensional picture of the inhomogeneous distribution of low-frequency magnetic field and to identify the object creating this field. In work are described physical methods which allow to increase sensitivity and to expand a working frequency range of the magneto-sensitive layer based on such liquid crystals. By us it has been shown, that the time of reorientation of director in oriented liquid crystals with magnetic nanoparticles is less than the analogous reorientation time in nonoriented crystals. In work also it is shown, that to significantly increase the speed of reorientation in a magnetic field of the director of liquid crystals with magnetic nanoparticles is possible if submitting an additional magnetic field with given amplitude. This method allows to increase sensitivity to a magnetic field and to receive parametrical amplification of signals in liquid crystals with magnetic nanoparticles. In the conclusion on the basis of liquid crystals with magnetic nanoparticles the scheme of system of detection of inhomogeneous magnetic field is described.

scholarly journals Магнитно-резонансная силовая спектроскопия колебаний магнитного вихря

2020 ◽  
Vol 90 (11) ◽  
pp. 1821
Author(s):  
В.Л. Миронов ◽  
Е.В. Скороходов ◽  
Д.А. Татарский ◽  
И.Ю. Пашенькин
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Longitudinal Magnetic Field ◽  
Low Frequency ◽  
Inhomogeneous Magnetic Field ◽  
Magnetic Vortex ◽  
Significant Shift ◽  
Main Attention ◽  
Micromagnetic Modeling ◽  
Spectroscopy Studies

We present the results of micromagnetic modeling and experimental magnetic resonance force spectroscopy studies of forced magnetization oscillations in a circle NiFe disk in an external longitudinal magnetic field. The main attention is paid to the low-frequency resonance associated with the gyrotropic motion of the magnetic vortex core. It is shown that the applying external magnetic field in the plane of the sample leads to a significant shift in the resonance frequency of the gyrotropic mode. The influence of the inhomogeneous magnetic field of the probe on the peculiarities of the magnetization oscillations is discussed.

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