Abstract
In the frequency band of 20 to 40 GHz, interaction between SHF radiation and a magnetic liquid that occupies the entire volume of a waveguide and is confined by a dielectric insert has been studied. There is a dependence between positions of alternating interference maxima and minima of the reflectivity of SHF radiation on one side and the intensity of applied magnetic field, and this dependence is controlled by changes in the complex magnetic permeability of the liquid. The paper describes a solution of the inverse problem, which yields parameters of the magnetic liquid, namely, the diameter of magnetic particles and the volume fraction of the solid phase in the magnetic liquid derived from measurements of the re ectivity versus frequency and its derivative.
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REFERENCES
Raikher, Yu.L. and Shliomis, M.I., On Theory of Magnetic Susceptibility Dispersion of Small Ferromagnetic Particles, Zh. Exp. Teor.Fiz., 1974, vol. 67, no. 3, pp. 1060-1073.
Fannin, P.C., Charles, S.W., and Relihan, T., Broad-band Measurement of the Complex Susceptibility of Magnetic Fluids, Meas. Sci. Technol., 1993, vol. 4, pp. 1160-1162.
Raikher, Y.L. and Stepanov, V.I., Intrinsic Magnetic Resonance in Superparamagnetic Systems, Phys. Rev. B, 1994, vol. 50, no. 9, pp. 6250-6259.
Raikher, Y.L. and Stepanov, V.I., Ferromagnetic Resonance in a Suspension of Single-Domain Particles, Phys. Rev. B, 1995, vol. 51, no. 22, pp. 16428-16431.
Fannin, P.C. and Charles, S.W., Measurement of the Neél Relaxation of Magnetic Particles in the Frequency Range 1 kHz to 160 MHz, J. Phys. D: Appl. Phys., 1991, vol. 24, pp. 76-77.
Fannin, P.C., Scaife, B.K.P., and Charles, S.W., High-frequency-band Resonance in Magnetic Fluids, Meas. Sci. Technol., 1992, vol. 3, pp. 1014-1015.
Fannin, P.C., Charles, S.W., and Relihan, T., Investigation of Ferromagnetic Resonance in Magnetic Fluids by Means of the Short-Circuited Coaxial Line Technique, J. Phys. D: Appl. Phys., 1995, vol. 28, pp. 2003-2006.
Usanov, D.A., SVCh metody izmereniya parametrov poluprovodnikov (SHF Techniques for Measuring Parameters of Semiconductors), Saratov: Saratov State University, 1985.
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Usanov, D.A., Skripal', A.V. & Kurganov, A.V. SHF Radiation Reflection Spectra of Composites Containing a Magnetic Liquid and Dielectric and Derivation of Magnetic Liquid Parameters. Russian Journal of Nondestructive Testing 38, 189–194 (2002). https://doi.org/10.1023/A:1020644009098
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DOI: https://doi.org/10.1023/A:1020644009098