Abstract
This chapter provides information on the history of magnetic materials and some basic definitions of magnetic phenomena. The origin of magnetism, along with Coulomb and Lorentz forces, is defined. Magnetic parameters such as magnetic induction, magnetization, magnetic polarization, permeability, susceptibility, and magnetic flux are introduced. Ampere's law, Faraday's law, Lenz's law, and Maxwell's equations are also presented. Then, different magnetic states, including diamagnetism, paramagnetism, ferromagnetism, antiferromagnetism and ferrimagnetism are described. The importance of several types of ferrites, such as hexagonal ferrites, spinel ferrites, garnets, and orthoferrites, is emphasized while explaining their crystal structures and the involvement of superexchange interactions. Finally, ferrite applications in microwave-absorbing media, hard disk drives, bioscience, photocatalysts, and permanent magnets are described. The importance of ferrites in modern electronics, telecommunication, and microwave devices is also explained.
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