Many studies have been conducted on Spinel, Garnet, and Hexa-ferrites in single and multi-doped concentrations. This article is an attempt to review the researcher's work on Ca, Ba, and Sr hexaferrite by substituting a variety of various ions such as Al, La, Sn, Zr, Co, Cr, and Ir. This review paper investigates M-type (Ca, Sr, Ba) Hexa-ferrites with a space group of P63/mmc that were synthesized using various techniques and characterized by XRD for crystallographic information, SEM and TEM for surface morphology, VSM for magnetic behaviour, and Vector Network Analyzer (VNA) for microwave absorption properties. Changes in a material's chemical composition affect features such as coercivity, saturation magnetization, and Curie temperature, as well as managing these properties and utilizing these compounds in the field of microwave absorption properties and magnetic field industry.
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