Synthesis and characterization of Transition metal ions doped Dysprosium iron garnets

Abstract

Rare earth iron garnets have received considerable attention over the past few years. These garnet structured materials were widely used in electronic devices such as circulators, oscillators, phase-shifters for the microwave region as well as in optoelectronics device and magneto-optical recording media. These wide ranges of applications were based on the huge variety of its physical properties, in particular, on the phenomenon of the sub-lattices magnetic moments compensation. Dysprosium iron oxide (DyIG) (Dy3Fe5O12) nanoferrites have gained much interest among the researchers due to their many valuable properties like high chemical stability, remarkable mechanical hardness, moderate saturation magnetization and high coercivity. These magnetic and electrical behaviors of nanoparticles depend upon nature of substituted element, size of the particle, phase formation, synthesis, microstructure and sintering temperature. Based on the above perspectives, the present thesis focuses on synthesis and characterization, such as structural and magnetic behaviors of some transition metal ions doped dysprosium iron garnets with respect to the dopant composition. newlineChapter 1 presents a brief introduction of nanotechnology and ferrimagnetic materials is given. Ferrimagnetic materials, namely spinel ferrites, Orthoferrites, Hexaferrites, and garnet ferrites, are introduced in this chapter. The particular emphasis is given on the garnet materials. Dysprosium iron garnet material is also introduced in this chapter. newlineChapter 2 deals with the experimental part related to synthesis of ferrite nanoparticles. This chapter also explains in detail about hydrothermal method of synthesizing nanoferrite. newline