The Response of a Magnetic Fluid to Radio Frequency Electromagnetic Field

• Authors: B. Dolník , M. Rajňák , R. Cimbala , I. Kolcunová , J. Kurimský , J. Balogh , J. Džmura , J. Petráš , P. Kopčanský , M. Timko , J. Briančin , M. Fabián
• Languages of publication: EN

Abstracts

EN

Electromagnetic pollution generated by the electrical devices has been regarded as a new form of pollution, harmful to the society as air and water pollution. The operation of electronic devices in a polluted electromagnetic environment has caused electromagnetic interference to become important concerns. Devices that are vulnerable to interference must often be shielded to protect them from the effects of electromagnetic interference. In this work we describe an interaction of a magnetic fluid based on transformer oil with alternating magnetic field. The magnetic fluid was composed of a transformer oil and dispersed magnetite nanoparticles coated with oleic acid. Among the wide range of topics covered, we pay attention to an important field related to the absorption of electromagnetic field by magnetic fluid as a suitable candidate for applications where it is necessary to electrically isolate, remove excess of heat, and to shield electromagnetic fields. We present a method for the determination of shielding effectiveness of the magnetic fluid under high-frequency excitation conditions from 750 MHz to 3 GHz by means of magnetic near field measurements and analysis. Herein, we report the effect of magnetic volume fraction in the magnetic fluid and the effect of the sample thickness on the shielding effectiveness. We have found that the magnetic fluid has a frequency dependent "windows", characterized that either absorb the magnetic field, or facilitate penetration of the magnetic field through the barrier.

Keywords

EN

41.20.Jb; 41.20.Gz; 75.50.Mm; 81.70.Ex; 07.50.Hp

Discipline

• 41.20.Gz: Magnetostatics; magnetic shielding, magnetic induction, boundary-value problems
• 41.20.Jb: Electromagnetic wave propagation; radiowave propagation(for light propagation, see 42.25.Bs; for electromagnetic waves in plasma, see 52.35.Hr; for atmospheric, ionospheric, and magnetospheric propagation, see 92.60.Ta, 94.20.Bb, and 94.30.Tz, respectively; see also 94.05.Pt Wave/wave, wave/particle interactions, in space plasma physics)
• 81.70.Ex: Nondestructive testing: electromagnetic testing, eddy-current testing
• 07.50.Hp: Electrical noise and shielding equipment
• 75.50.Mm: Magnetic liquids

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 946-948

Dates

published

2017-04

Contributors

author

B. Dolník

• Department of Electrical Power Engineering, TU of Košice, Mäsiarska 74, 041 20 Košice, Slovakia

author

M. Rajňák

• Department of Electrical Power Engineering, TU of Košice, Mäsiarska 74, 041 20 Košice, Slovakia
• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

R. Cimbala

• Department of Electrical Power Engineering, TU of Košice, Mäsiarska 74, 041 20 Košice, Slovakia

author

I. Kolcunová

• Department of Electrical Power Engineering, TU of Košice, Mäsiarska 74, 041 20 Košice, Slovakia

author

J. Kurimský

• Department of Electrical Power Engineering, TU of Košice, Mäsiarska 74, 041 20 Košice, Slovakia

author

J. Balogh

• Department of Electrical Power Engineering, TU of Košice, Mäsiarska 74, 041 20 Košice, Slovakia

author

J. Džmura

• Department of Electrical Power Engineering, TU of Košice, Mäsiarska 74, 041 20 Košice, Slovakia

author

J. Petráš

• Department of Electrical Power Engineering, TU of Košice, Mäsiarska 74, 041 20 Košice, Slovakia

author

P. Kopčanský

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

M. Timko

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

J. Briančin

• Institute of Geotechnic, SAS, Watsonova 45, 043 53 Košice, Slovakia

author

M. Fabián

• Institute of Geotechnic, SAS, Watsonova 45, 043 53 Košice, Slovakia

References

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Identifiers

DOI

10.12693/APhysPolA.131.946