Change in the Dynamic Susceptibility of a Magnetic Fluid with Hard Magnetic Particles with an Increase in the Viscosity of the Base Medium
https://doi.org/10.21869/2223-1528-202212-4-140-151
Abstract
Purpose of the work. To find out to what extent the Neel mechanism of magnetization relaxation affects the dynamic susceptibility of a magnetic fluid based on magnetically hard particles of cobalt ferrite.
Research method consists in measuring the dynamic susceptibility of a ferrofluid based on cobalt ferrite particles dispersed in water. The measurements were carried out using a mutual induction bridge. In our experiments, the Brownian relaxation time of the magnetization was varied by successively adding small amounts of polyvinyl alcohol. At the same time, all other liquid parameters, such as temperature, concentration, and dispersion composition, remained constant.
Results. The frequency dependences of the dynamic susceptibility were measured for four liquid samples with viscosities of 3.4, 8.3, 23, and 117 cP at room temperature. The dependences obtained have a quasi-Debye form with a pronounced maximum on the frequency dependence of the imaginary part of the dynamic susceptibility. As the viscosity of the magnetic fluid increases, the dependences obtained show a gradual increase in the characteristic time of magnetization relaxation. The energy dissipation maximum (the position of the maximum on the imaginary part of the susceptibility) shifts towards low frequencies. In this case, the shift of the maximum is significantly ahead of the increase in the viscosity of the liquid. The relative width of the energy absorption maximum also grows continuously.
Conclusion. The observed dependences cannot be explained on the basis of the concepts of complete freezing-in of the magnetic moments of particles. Obviously, the Neel mechanism of magnetization relaxation continues to play a significant role in the process of dynamic magnetization of cobalt ferrite particles. The results obtained can serve as a basis for further development of the theory of Néel relaxation of the magnetization of nanosized particles.
About the Author
A. V. Lebedev
Institute of Continuum Mechanics of the Ural Branch Russian Academy of Sciences
Russian Federation
Russian Federation
Aleksandr V. Lebedev, Dr. of Sci. (Physics and Mathematics), Senior Researcher at the Laboratory of Disperse Systems Dynamics
1 Academika Koroleva Str., Perm 614013
References
1. Shliomis M. I. Magnitnye zhidkosti [Magnetic fluids]. Uspekhi fizicheskikh nauk = Successes of Physical Sciences, 1974, vol. 17, pp. 153–169.
2. Raikher Y. L., Stepanov V. I. Linear and cubic dynamic susceptibilities of superparamagnetic fine particles. Physical Review B. 1997, vol. 55, nо. 22. P. 15005–15017.
3. Raikher Yu. L., Stepanov V. I. Physical aspects of magnetic hyperthermia: Low-frequency ac field absorption in a magnetic colloid. Journal of Magnetism and Magnetic Materials, 2014, vol. 368, pp. 421–427. https://doi.org/10.1016/j.jmmm.2014.01.070
4. Pshenichnikov A. F., Lebedev A. V. Dinamicheskaya vospriimchivost' magnitykh zhidkostei [Dynamic susceptibility of magnetic liquids]. Zhurnal eksperimental'noi i teoreticheskoi fiziki = Soviet Physics – Journal of Experimental and Theoretical Physics, 1989, vol. 68, nо. 3, pp. 498–502.
5. Lebedev A. V. Razlichie mezhdu brounovskim i neelevskim mekhanizmami relaksatsii v podmagnichivayushchem pole [Difference between Brownian and Néel relaxation mechanisms in a magnetizing field]. Vestnik Permskogo universiteta. Fizika = Bulletin of Perm University. Physics, 2021, nо. 4, pp. 21–29. https://doi.org/10.17072/1994-3598-2021-4-21-29
6. Elmore W. C. On preparation of the magnetite high dispersed. Phys. Rev., 1938, vol. 54, pp. 309– 310.
7. Gribanov N. M., Bibik E. E., Buzunov O.V., Naumov V. N. Physico-chemical regularities of obtaining highly dispersed magnetite by the method of chemical condensation. Journal on Magnetism and Magnetic Materials, 1990, vol. 85, pp. 7–10.
8. Bibik E. E., Lavrov I. S. USSR Inventor’s Certificate. Sposob polucheniya ferrozhidkosti [Method of obtaining ferrite particles]. Patent RF, no. 457666, 1975.
9. Lysenko S. N., Yakusheva D. E., Astafyeva S. A. Sposob polucheniya chastits ferritov [Method for producing ferrite particles]. Patent RF, no. 2725231, 2020.
10. Bean С. P., Jacobs I. S. Magnetic granulometry and super-magnetism. Journal Applied. Physics, 1956, vol. 27, pp. 1448.
11. Kaiser R., Miskolczy G. Magnetic properties of stable dispersions of subdomain magnetite particles. Journal Applied Physics, 1970, vol. 41, pp. 1064.
12. Bibik E. E., Matygullin B. Ya., Raykher Yu. L., Shliomis M. I. Magnetostatic properties of magnetite colloids. Magnetohydrodynamics, 1973, vol. 9, nо. 1, pp. 68–72.
13. Chantrell R. W., Popplewell J., Charles S. R. Measurements of particle size distribution parameters in ferrofluids. IEEE Trans. on Magnetics, 1978, vol. 14(5), pp. 975–977.
14. Pshenichnikov A. F., Mekhonoshin V. V., Lebedev A. V. Magneto-granulometric analizis of concentrated ferrocolloids. Journal on Magnetism and Magnetic Materials, 1996, vol. 161, pp. 94–102.
15. Ivanov A. O., Kuznetsova O. B. Magnetic properties of dense ferrofluids: An influence of interparticle correlations. Phys. Rev. E, 2001. vol. 64, pp. 041405.
16. Ivanov A. O., Kuznetsova O. B. Magnitogranulometricheskii analiz ferrokolloidov: modifitsirovannaya model' srednego polya vtorogo poryadka [Magnetogranulometric analysis of ferrocolloids: second-order modified mean field theory]. Kolloidnyi zhurnal = Colloid Journal, 2006, vol. 68, pp. 430–440. http://dx.doi.org/10.1134/S1061933X06040065
17. Lebedev A. V. Dipol'noe vzaimodeistvie chastits v magnitnykh zhidkostyakh [Dipole interparticle interaction in magnetic fluids]. Kolloidnyi zhurnal = Colloid Journal, 2014, vol. 76, no. 3, pp. 334–341.
18. Pshenichnikov A. F., Lebedev A. V., Radionov A. V., Efremov D. V. Magnitnaya zhidkost' dlya raboty v sil'nykh gradientnykh polyakh [A Magnetic fluid for operation in strong gradient fields]. Kolloidnyi zhurnal = Colloid Journal, 2015, vol. 77, no. 2, pp. 196–201.
19. Tablitsy fizicheskikh velichin [Tables of physical quantities]; ed. by acad. I. Kikoin. Moscow, Atomizdat Publ., 1976. 1008 p.
20. Pshenichnikov A. F. Most vzaimnoi induktivnosti dlya analiza magnitnykh zhidkostei [A mutualinductance bridge for analysis of magnetic fluids]. Pribory i tekhnika eksperimenta = Instruments and Experimental Techniques, 2007, vol. 50, no 4, pp. 509–514. http://dx.doi.org/10.1134/S0020441207040136
Review
For citations:
Lebedev A.V. Change in the Dynamic Susceptibility of a Magnetic Fluid with Hard Magnetic Particles with an Increase in the Viscosity of the Base Medium. Proceedings of the Southwest State University. Series: Engineering and Technology. 2022;12(4):140-151. (In Russ.) https://doi.org/10.21869/2223-1528-202212-4-140-151
Views:
105
Email this article 