Abstract
Ferrites are oxide elements with remarkable magnetic and electrical properties that have wide applications in the field of electrical, electronics, e.g., radio, television, video tape recorder, transformer core, antenna rod, microwave devices, magnetic recording, internet technology, magneto-optical displays, humidity sensor, etc., and biomedicals like drug delivery, X-ray enhancement, detoxification, peptide synthesis, etc. Most of these applications are based upon the properties like saturation magnetization, high Curie temperature, high electrical resistivity but low loss, and good chemical stability. Ferrites can be obtained in three different forms according to their crystalline structure: spinel, garnet, and hexagonal. The magnetic properties of ferrites are due to the magnetic moments of individual tetrahedral (A) and octahedral (B) sublattice. The magnetic moments are highly dependent on parameters like magnetocrystalline anisotropy, particle/grain size, cationic distribution in A and B sites, surface effect, microstructure of the sample, type of dopants (nonmagnetic/magnetic), doping concentration, etc. Here in this chapter, we have discussed qualitatively the basic physics of the control over the magnetic behavior of ferrites.
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