Effects of Mg substitution on the structural and magnetic properties of Co0.5Ni0.5−x MgxFe2O4 nanoparticle ferrites*Project supported by the Ibnu Sina Institute for Scientific and Industrial Research, Physics Department of Universiti Teknologi Malaysia and the Ministry of Education Malaysia (Grant Nos. Q.J130000.2526.04H65). (25th February 2016)

• Record Type: Journal Article
• Authors: Rosnan, R M; Othaman, Z; Hussin, R; Ati, Ali A; Samavati, Alireza; Dabagh, Shadab; Zare, Samad
• Is Part Of: Chinese physics B. Volume 25:Number 4(2016)
• Publication Date: 2016-02-25
• Subjects: 75.47.Lx -- 75.60.–d -- 75.75.–c -- 81.20.Fw; co-precipitation -- magnetic materials -- spinel ferrite; -- magnetic properties; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1674-1056/25/4/047501
• Languages: English
• ISSNs: 1674-1056

Abstract

Abstract: In this study, nanocrystalline Co–Ni–Mg ferrite powders with composition Co0.5 Ni0.5− x Mg x Fe2 O4 are successfully synthesized by the co-precipitation method. A systematic investigation on the structural, morphological and magnetic properties of un-doped and Mg-doped Co–Ni ferrite nanoparticles is carried out. The prepared samples are characterized using x-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and vibrating sample magnetometry (VSM). The XRD analyses of the synthesized samples confirm the formation of single-phase cubic spinel structures with crystallite sizes in a range of ∼ 32 nm to ∼ 36 nm. The lattice constant increases with increasing Mg content. FESEM images show that the synthesized samples are homogeneous with a uniformly distributed grain. The results of IR spectroscopy analysis indicate the formation of functional groups of spinel ferrite in the co-precipitation process. By increasing Mg 2+ substitution, room temperature magnetic measurement shows that maximum magnetization and coercivity increase from ∼ 57.35 emu/g to ∼ 61.49 emu/g and ∼ 603.26 Oe to ∼ 684.11 Oe (1 Oe = 79.5775 A·m −1 ), respectively. The higher values of magnetization M s and M r suggest that the optimum composition is Co0.5 Ni0.4 Mg0.1 Fe2 O4 that can be applied to high-density recording media and microwave devices.