Version 1
: Received: 10 October 2024 / Approved: 10 October 2024 / Online: 11 October 2024 (04:36:20 CEST)
How to cite:
Marin, C. N.; Fannin, P. C.; Malaescu, I. Polarizing Magnetic Field Effect on Some Electrical Properties of a Ferrofluid in Microwave Field. Preprints2024, 2024100816. https://doi.org/10.20944/preprints202410.0816.v1
Marin, C. N.; Fannin, P. C.; Malaescu, I. Polarizing Magnetic Field Effect on Some Electrical Properties of a Ferrofluid in Microwave Field. Preprints 2024, 2024100816. https://doi.org/10.20944/preprints202410.0816.v1
Marin, C. N.; Fannin, P. C.; Malaescu, I. Polarizing Magnetic Field Effect on Some Electrical Properties of a Ferrofluid in Microwave Field. Preprints2024, 2024100816. https://doi.org/10.20944/preprints202410.0816.v1
APA Style
Marin, C. N., Fannin, P. C., & Malaescu, I. (2024). Polarizing Magnetic Field Effect on Some Electrical Properties of a Ferrofluid in Microwave Field. Preprints. https://doi.org/10.20944/preprints202410.0816.v1
Chicago/Turabian Style
Marin, C. N., Paul C. Fannin and Iosif Malaescu. 2024 "Polarizing Magnetic Field Effect on Some Electrical Properties of a Ferrofluid in Microwave Field" Preprints. https://doi.org/10.20944/preprints202410.0816.v1
Abstract
The complex dielectric permittivity, ε (f, H) = εʹ (f, H)- i εʺ (f, H), in the microwave frequency range f, of (0.1 - 3) GHz and polarizing field values H, in the range of (0 - 135) kA/m, was measured for a kerosene-based ferrofluid with magnetite particles. A relaxation process attributed to interfacial type relaxation was highlighted, determining for the first time in the microwave field, the activation energy of the dielectric relaxation process in the presence of the magnetic field, EA(H), in relation to the activation energy in zero field, EA(H=0). Based on the complex permittivity measurements and the Claussius-Mossotti equation, the dependencies on frequency (f), and magnetic field (H), of the polarizability (α) and electrical conductivity (σ), were determined. From the dependence of α(f,H), the electric dipolar moment, p, of the particles in the ferrofluid, was determined. The conductivity spectrum, σ(f,H), was found to be in agreement with Jonscher's universal law and the electrical conduction mechanism in the ferrofluid was explained using both Mott's VRH (variable range hopping) model and CBH (correlated barrier hopping) model. Based on these models and conductivity measurements, the hopping distance, Rh, of the charge carriers and the maximum barrier height, Wm, for the investigated ferrofluid was determined for the first time in the microwave field. Knowledge of these electrical properties of the ferrofluid in the microwave field is useful for explaining the mechanisms of polarization and control of electrical conductivity with an external magnetic field, in order to use ferrofluids in various technological applications in microwave field.
Keywords
ferrofluid; complex dielectric permittivity; polarizability; relaxation process; DC and AC conduc-tivity; VRH and CBH models
Subject
Chemistry and Materials Science, Electronic, Optical and Magnetic Materials
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
