The role of flash auto-combustion method and Mn doping in improving dielectric and magnetic properties of CoFe 2 O 4
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The role of flash auto‑combustion method and Mn doping in improving dielectric and magnetic properties of CoFe2O4 A. M. A. Henaish1,2 · O. M. Hemeda1 · A. Alqarni3 · D. E. El Refaay3,4 · Sh. Mohamed1,5 · Mahmoud A. Hamad5 Received: 28 June 2020 / Accepted: 26 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this work, we prepared C o1–xMnxFe2O4 (CMFO) ferrites at different levels of doping x = 0.0, 0.1, 0.3, 0.5 and 0.7 using flash auto-combustion method, aiming to obtain promising results more than CoFe2O4 ferrite prepared by other methods. The results show an increase in lattice constant of CMFO with Mn content. In addition, there are many intra-granular pores and significant fusion of the small grains into larger grains. The dielectric properties of CMFO ferrites are enhanced with Mn content. Furthermore, saturation magnetization (MS) and remanent magnetization (Mr) of CMFO are improved slightly with Mn content up to x = 0.1 and then decrease with higher Mn content. The coercivity (HC) of CMFO ferrite decreases with Mn content until it reaches minimum value of 971 Oe for level of Mn substitution x = 0.5; on further Mn content (X = 0.7), it is observed that H c increases to 1249 Oe. In comparison to previous works, HC (x = 0) and MS and Mr for our sample (x = 0.1) are significantly more than corresponding values obtained for CoFe2O4 ferrite prepared by other methods. Keywords Co1–xMnxFe2O4 · XRD · Dielectric constant · Magnetic properties
1 Introduction In recent years, the ferrites have been known as great practical materials as well as the special class of magnetic compounds [1–10]. Because of their significant dielectric, magnetic properties, they are used in wide ranges of applications at different fields of technology (energy, refrigeration, and health) [11–19]. C oFe 2O 4 is one of the important types of ferrites which exhibit remarkable properties, such as good mechanical hardness, chemical stability and high magnetostriction, with high saturation magnetization, high coercivity and high anisotropy [20, 21]. * Mahmoud A. Hamad [email protected] 1
Physics Department, Faculty of Science, Tanta University, Tanta, Egypt
2
NANOTECH Center, Ural Federal University, 620002 Yekaterinburg, Russia
3
Physics Department, Faculty of Science, King Khalid University, Abha, Saudi Arabia
4
Physics Department, Faculty of Science, Suez University, Suez, Egypt
5
Basic Science Department, Higher Institute of Engineering and Technology, King Marriott Academy, Alexandria, Egypt
These properties are useful in various potential applications, such as magnetic resonance imaging, transformer cores, high-frequency inductor, high-quality filter, permanent magnets, high-density information storage, micro-electromechanical systems (MEMS) and micro-wave devices [22-25]. The spinel ferrite structure is written as ( M2+1-δ Fe3+δ)tetra [M2+δ Fe3+2-δ]octa where M is a divalent metal ion like Co2+, Ni2+, Mg2+, etc. and Fe is a trivalent iron ion with δ as degree of in
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