Magnetic Properties and Reflection Loss Characteristic of Mn-Ti Substituted Barium-Strontium Hexaferrite

Abstract:

The magnetic and microwave absorbing properties of the Mn-Ti substituted barium strontium hexaferrite, Ba_0.5Sr_0.5Fe_12-xMn_x/2Ti_x/2O₁₉ (x: 0; 0.2 and 0.4) prepared by a mechanical alloying technique were investigated. Material phases in synthesized samples were identified by XRD from which results confirmed that the sinthesized material was a single phase material. The hysteresis loop for the samples as analyzed by a permagraph showing those of typical of hexaferrite permanent magnet but with both remanence and coercivity decreased remarkably with the increasing fraction of Mn-Ti. The reflection coefficients S11, S21 of the ferrite samples were measured in the X-band frequency range (9-15 GHz) and their absorbing properties were calculated according to transmission line theory. It was observed that the absorption was taking place in the whole frequency range between 9 and 15 GHz. In addition, resonance frequencies have shifted due to the Mn-Ti substitution in barium-strontium hexaferrite. It is concluded that the Mn-Ti substituted barium-strontium hexaferrites would be a good potential candidate for electromagnetic absorbers and for other practical applications at high frequencies.

• Periodical: Advanced Materials Research (Volume 896)
• Pages: 418-422
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.896.418
• Online since: February 2014
• Authors: Viktor Vekky Ronald Repi*, Azwar Manaf, Bambang Soegiono
• Keywords: Barium Hexaferrite, Magnetic Property, Mechanical Alloying, Microwave Absorber Properties, Reflection Loss

References

[1] A. Yusoff, M. Abdullah, S. Ahmad, S. Jusoh, A. Mansor dan S. Hamid, Electromagnetic and absorption properties of some microwave absorbers, J. Appl. Phys., vol. 92, no. 2, pp.876-882, 15 July (2002).

DOI: 10.1063/1.1489092

[2] Y. Feng, T. Qiu dan C. Shen, Absorbing properties and structural design of microwave absorbers based on carbonyl iron and barium ferrite, Journal of Magnetism and Magnetic Materials, no. 318, pp.8-13, (2007).

DOI: 10.1016/j.jmmm.2007.04.012

[3] T. Kagotani, D. Fujiwara, S. Sugimoto, K. Inomata dan M. Homma, Enhancement of GHz electromagnetic wave absorption characteristics in alignd M-type barium ferrite Ba1-xLaxFe12-x-y(Me0. 5Mn0. 5)yO19 (x=0. 0-0. 5; y=1. 0-3. 0, Me: Zr, Sn) by metal substitution, Journal of Magnetism and Magnetic Materials, pp. e1813-e1815, (2004).

DOI: 10.1016/j.jmmm.2003.12.878

[4] M. Meshram, N. K. Agrawal, B. Sinha dan P. Misra, Characterization of M-type barium hexagonal ferrite-based wide band microwave absorber, Journal of Magnetism and Magnetic Materials, no. 271, pp.207-214, (2006).

DOI: 10.1016/j.jmmm.2003.09.045

[5] A. Ghasemi, A. Hossienpour, A. Morisako, A. Saatchi dan M. Salehi, Electromagnetic properties and microwave absorbing characteristics of doped barium hexaferrite, Journal of Magnetism and Magnetic Materials, no. 302, pp.429-435, (2006).

DOI: 10.1016/j.jmmm.2005.10.006

[6] C. Singh, S. B. Narang, I. Hudiara, Y. Bai dan K. Marina, Hysteresis analysis of Co–Ti substituted M-type Ba–Sr hexagonal ferrite, Materials Letters, no. 63, pp.1921-1924, (2009).

DOI: 10.1016/j.matlet.2009.06.002

[7] P. Sharma, R. Rocha, S. Medeiros, B. Hallouche dan A. P. Jr, Structural and magnetic studies on mechanosynthesized BaFe12-xMnxO19, Journal of Magnetism and Magnetic Materials, no. 316, pp.29-33, (2007).

DOI: 10.1016/j.jmmm.2007.03.207

[8] J. Qiu, M. Gu dan H. Shen, Microwave absorption properties of Al- and Cr-substituted M-type barium hexaferrite, Journal of Magnetism and Magnetic Materials, no. 295, pp.263-268, (2005).

DOI: 10.1016/j.jmmm.2005.01.018

[9] F. Tabatabaie, M. Fathi, A. Saatchi dan A. Ghasemi, Microwave absorption properties of Mn- and Ti-doped strontium hexaferrite, Journal of Alloys and Compounds, no. 470, pp.332-335, (2009).

DOI: 10.1016/j.jallcom.2008.02.094