volume | PIER Journals

Abstract

This work investigates the variation of the real part of the complex magnetic permeability of a Ni-Zn ferrite for application to temperature sensors. Ferrite samples were fabricated by means of the conventional ceramic method. Zinc, nickel and iron oxides were used as raw materials. The samples were sintered at 1200, 1300, and 1400^oC. The complex magnetic permeability of the samples was measured at temperatures ranging from -40^oC to +50^oC. The complex magnetic permeability of the samples was analyzed in the 100 kHz--100 MHz frequency range, and the temperature sensitivity of the magnetic permeability (μr'/T) was analyzed at 100 kHz. The magnetic permeability variation of the ferrite permits to use it as a temperature transducer with a maximum temperature sensitivity of about -119^oC^-1. The highest magnitudes of temperature sensitivity occurred between +30^oC and +50^oC. Therefore, the ferrite could be sensitive enough to allow temperature measurements at the human body temperature level. The results indicate that the temperature range of maximum temperature sensitivity of the ferrite may be adjusted by means of appropriate selection of the fabrication parameters.

1. Brito, V. L. O., A. C. C. Migliano, L. V. Lemos, and F. C. L. Melo, "Ceramic processing route and characterization of a Ni-Zn ferrite for application in a pulsed-current monitor," Progress In Electromagnetics Research, Vol. 91, 303-318, 2009.
doi:10.2528/PIER09031603

2. Sedlar, M., V. Matejec, and I. Paulicka, "Optical fibre magnetic field sensors using ceramic magnetostrictive jackets," Sens. Act. A, Vol. 84, 297-302, 2000.
doi:10.1016/S0924-4247(00)00403-9

3. Bienkowski, A. and R. Szewczyc, "The possibility of utilizing the high permeability magnetic materials in construction of magnetoelastic stress and force sensors," Sens. Act. A, Vol. 113, 270-276, 2004.
doi:10.1016/j.sna.2004.01.010

4. Zhang, G., C. Li, F. Cheng, and J. Chen, "ZnFe2O4 tubes: Synthesis and application to gas sensors with high sensitivity and low-energy consumption," Sens. Act. B, Vol. 120, 403-410, 2007.
doi:10.1016/j.snb.2006.02.034

5. Arshak, K. and I. Gaidan, "Development of a novel gas sensor based on oxide thick films," Mat. Sci. Eng. B, Vol. 118, No. 1--3, 44-49, 2005.
doi:10.1016/j.mseb.2004.12.061

6. Shin, H.-S., Ferrite device for sensing temperature, U.S. Patent No. 5,775,810, 1998.

7. Kim, Y. H., S. Hashi, K. Ishiyama, K. I. Arai, and M. Inoue, "Remote temperature sensing system using reverberated magnetic flux," IEEE Trans. Magn., Vol. 36, No. 5, 3643-3645, 2000.
doi:10.1109/20.908927

8. Osada, H., K. Seki, H. Matsuki, S. Kikuchi, and K. Murakami, "Temperature-sensitive magnetic thin-film for micro sensor," IEEE Trans. Magn., Vol. 31, No. 6, 3164-3166, 1995.
doi:10.1109/20.490315

9. Osada, H., S. Chiba, H. Oka, H. Hatafuku, N. Tayama, and K. Seki, "Non-contact magnetic temperature sensor for biochemical applications," J. Magn. Magn. Mater., Vol. 272--276, e1761-e1762, 2004.
doi:10.1016/j.jmmm.2003.12.989

10. Valenzuela, R., Magnetic Ceramics, 131, Cambridge University Press, 1994.

11. Cedillo, E., J. Ocampo, V. Rivera, and R. Valenzuela, "An apparatus for the measurement of initial magnetic permeability as a function of temperature," J. Phys. E: Sci. Inst., Vol. 13, No. 4, 383-386, 1980.
doi:10.1088/0022-3735/13/4/005

12. Brito, V. L. O., Selecao, elaboracao e caracterizacao de ferritas Ni-Zn para aplicacao em monitores de corrente pulsada, Ph.D. Thesis, 38, Sao Jose dos Campos, Instituto Tecnologico de Aeronautica, 2007.

13. Naoe, M., R. Takahashi, T. Omura, Y. Hotta, T. Sato, K. Yamasawa, and Y. Miura, "Basic investigation of microtemperature sensor by means of a novel transmission-line technique using a temperature-sensitive Li-Zn-Cu ferrite substrate," J. Magn. Magn. Mater., Vol. 320, e949-e953, 2008.
doi:10.1016/j.jmmm.2008.04.072

14. Cortes, A. L., A. C. C. Migliano, V. L. O Brito, and A. J. F. Orlando, "Practical aspects of the characterization of ferrite absorber using one-port device at RF frequencies," PIERS Proceedings, 683-687, Beijing, China, March 26--30, 2007.

15. Verma, A. and R. Chatterjee, "Effect of zinc concentration on the structural, electrical and magnetic properties of mixed Mn-Zn and Ni-Zn ferrites synthesized by the citrate precursor technique," J. Magn. Magn. Mater., Vol. 306, 313-320, 2006.
doi:10.1016/j.jmmm.2006.03.033

16. Gul, I. H., W. Ahmed, and A. Maqsood, "Electrical and magnetic characterization of nanocrystalline Ni-Zn ferrite synthesis by co-precipitation route," J. Magn. Magn. Mater., Vol. 320, 270-275, 2008.
doi:10.1016/j.jmmm.2007.05.032

17. Gignoux, D. and M. Schlenker, Magnetism: Fundamentals, 129, Springer, 2005.

18. Goldman, A., Modern Ferrite Technology, 398, Springer, 2006.

Dr. Vera Lucia Othero de Brito

Dr. Luiz Fernando Alves De Almeida

Dr. Anderson Kenji Hirata

Dr. Antonio Carlos da Cunha Migliano