Tunable magneto-dielectric properties of magnetic fluid at radio-microwave frequencies

•Complex magnetic permeability is measured for magnetic fluid in 0.3 MHz to 3 GHz frequency range.•Effect of particle concentration, static magnetic field with different strength and orientation is studied.•Tuning energy loss is important in radio-microwave devices like attenuator, or in EM shieldin...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2020-03, Vol.498, p.166127, Article 166127
Main Authors: Jadav, Mudra, Bhatnagar, S.P.
Format: Article
Language:English
Subjects:
Attenuators
Complex permeability
Dielectric properties
Dielectric strength
Field strength
Fluids
Frequency ranges
Magnetic fluid
Magnetic fluids
Magnetic permeability
Magnetic properties
Microwave absorbers
Microwave device
Microwave frequencies
Nanoparticles
Soft ferrite
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Summary:•Complex magnetic permeability is measured for magnetic fluid in 0.3 MHz to 3 GHz frequency range.•Effect of particle concentration, static magnetic field with different strength and orientation is studied.•Tuning energy loss is important in radio-microwave devices like attenuator, or in EM shielding, hyperthermia application. Frequency dependent complex magnetic permeability is determined for a laboratory synthesized magnetic fluid having magnetite nanoparticles in the frequency range 0.3 MHz to 3 GHz. The effect of particle concentration, static magnetic field strength and field orientation over dielectric properties of magnetic fluid is studied. The discussion in this paper indicates that loss tangent (tan δ) can be controlled using these parameters. These fluids are suitable for the application in microwave absorber or tunable attenuators.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.166127