Frequency Dependence of an Electromagnetic Absorption Coefficient in Magnetic Fluid

Гареев, К. Г.; Лучинин, В. В.; Sevost’yanov, E. N.; Testov, Igor O.; Testov, Oleg A.

doi:10.1134/s1063784219060069

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…This type of stands allows laboratory studies of the effectiveness of EMR shielding by various materials without using expensive anechoic chambers to be carried out. The principle of operation of the stand [32] is based on the generation and detection of electromagnetic energy by a ZVB-20 vector network analyzer (Rhode and Schwarz, Munich, Germany), to which the P6-124 measuring horn antennas (CJSC SKARD-Electronics, Kursk, Russia) with an operating frequency range of 2.0-18.0 GHz are connected. A test sample with the dimensions of at least 170 × 170 mm is installed in the gap between the horn antennas (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

Providing a Specified Level of Electromagnetic Shielding with Nickel Thin Films Formed by DC Magnetron Sputtering

et al. 2021

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Nickel films of 4–250 nm thickness were produced by DC magnetron sputtering onto glass and silicon substrates. The electrical properties of the films were investigated by the four-probe method and the surface morphology of the films was studied by atomic force microscopy. To measure the shielding effectiveness, a portable closed stand based on horn antennas was used. A theoretical assessment of the shielding effectiveness of nickel films of various thickness under electromagnetic radiation of a range of frequencies was carried out using two different approximations. The results demonstrate the shielding effectiveness of up to 35 dB of the nickel thin films in the frequency range of 2–18 GHz.

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Section: Methodsmentioning

confidence: 99%

Providing a Specified Level of Electromagnetic Shielding with Nickel Thin Films Formed by DC Magnetron Sputtering

et al. 2021

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“…The ability to change physical and chemical properties, up to the state of aggregation (liquid/solid) under the influence of a magnetic field, allows the use of magnetic fluids in a wide variety of applications [1,2]. The ability of oriented and structured magnetic fluids to change absorption in a wide range of the spectrum is of great interest, which is used to control the parameters of electromagnetic radiation in the THz area of the spectrum [3][4][5][6]. Another very wide and promising area of application of magnetic fluids is medicine, where such materials are used for magnetic separation, magnetic hyperthermia, magnetic targeted drug delivery [7], magnetic resonance imaging and a number of other applications [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Magneto-optical properties of nanoparticle dispersions based on Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-, obtained by pulse laser ablation in a liquid

O.V.

A.E.

O.S.

et al. 2022

Physics of the Solid State

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The structure, optical and magneto-optical properties of colloidal solutions of iron oxide nanoparticles obtained by pulsed ablation in distilled water, both without additives and with various functional additives: gold-hydrochloric acid, silicon oxide, and polyvinylpyrrolidone, have been studied. It is shown that the main magnetic phase is magnetite Fe3O4. The size distribution of nanoparticles and the degree of their agglomeration depend on the additives. In the absence of the latter, a very wide of size distributions and strong agglomeration of particles are observed. The narrowest distribution curve with a maximum corresponding to ~7 nm and an almost complete absence of agglomeration are observed for particles synthesized in the presence of polyvinylpyrrolidone. The shape of the spectral dependence of magnetic circular dichroism, which generally corresponds to the spectrum of magnetite, undergoes some modifications for various additives, which is associated with defects in the distribution of iron ions between different positions in the crystal. Keywords: pulsed laser ablation, nanoparticles, colloidal solutions, magnetite, magnetic circular dichroism.

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“…Способность изменять физико-химические свойства, вплоть до агрегатного состояния (жидкое/твердое) под воздействием магнитного поля, позволяет использовать магнитные жидкости в самых разнообразных приложениях [1,2]. Представляет интерес способность ориентированных и структурированных магнитных жидкостей изменять поглощение в широкой области спектра, что, применяется для управления параметрами электромагнитного излучения в ТГц области спектра [3][4][5][6]. Другая, весьма широкая и перспективная область применения магнитных жидкостей -это медицина, где такие материалы используются для магнитной сепарации, магнитной гипертермии, магнитной адресной доставки лекарств [7], магнитной резонансной томографии и ряда других приложений [8][9][10].…”

Section: Introductionunclassified

Магнитооптические свойства дисперсий наночастиц на основе Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-, полученных методом импульсной лазерной абляции в жидкости

Солодова¹,

Соколов²,

Ivanova³

et al. 2021

Физика Твердого Тела

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The structure, optical and magneto-optical properties of colloidal solutions of iron oxide nanoparticles obtained by pulsed ablation in distilled water, both without additives and with various functional additives: gold-hydrochloric acid, silicon oxide, and polyvinylpyrrolidone, have been studied. It is shown that the main magnetic phase is magnetite Fe3O4. The size distribution of nanoparticles and the degree of their agglomeration depend on the additives. In the absence of the latter, a very wide of size distributions and strong agglomeration of particles are observed. The narrowest distribution curve with a maximum corresponding to ~ 7 nm and an almost complete absence of agglomeration are observed for particles synthesized in the presence of polyvinylpyrrolidone. The shape of the spectral dependence of magnetic circular dichroism, which generally corresponds to the spectrum of magnetite, undergoes some modifications for various additives, which is associated with defects in the distribution of iron ions between different positions in the crystal.

show abstract

Frequency Dependence of an Electromagnetic Absorption Coefficient in Magnetic Fluid

Cited by 9 publications

References 9 publications

Providing a Specified Level of Electromagnetic Shielding with Nickel Thin Films Formed by DC Magnetron Sputtering

Providing a Specified Level of Electromagnetic Shielding with Nickel Thin Films Formed by DC Magnetron Sputtering

Magneto-optical properties of nanoparticle dispersions based on Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-, obtained by pulse laser ablation in a liquid

Магнитооптические свойства дисперсий наночастиц на основе Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-, полученных методом импульсной лазерной абляции в жидкости

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