What Are Ferrites?

Magnetic ceramics mainly refer to ferrite ceramics. Ferrites are composite oxides based on iron oxide and other iron or rare earth oxides. Ferrites are mostly semiconductors, the resistivity is much larger than that of general metal magnetic materials, and has the advantage of small eddy current loss. It has been widely used in the fields of high-frequency and microwave technologies, such as radar technology, communication technology, space technology, and electronic computers [1] .

Magnetic ceramics are also called ferrites. These materials refer to composite oxide magnetic materials with iron ions, oxygen ions, and other metal ions. There are a few magnetic oxides that do not contain iron. According to the application classification, these materials can be divided into soft magnetic, hard magnetic, gyromagnetic, moment magnetic and piezomagnetic. Soft magnetic ceramic material is currently the most widely used and most widely used type of magnetic ceramics, which is characterized by high initial permeability and easy magnetization and demagnetization. [2]
From the perspective of the properties and uses of magnetic ceramics, it can be divided into magnetic ceramics such as soft magnetic, hard magnetic, gyromagnetic, piezomagnetic bubble, magneto-optical and thermal sensitive.
From the perspective of the crystal structure of magnetic ceramics, there are three main types:
Magnetic ceramic is a very versatile functional material. As one of the basic materials of the electronics industry, it has been greatly developed in recent years. Many new types of magnetic ceramics have been researched and developed, such as high frequency and low power consumption ferrites for switching power supplies, broadband microwave absorbing ferrites, high coercivity nanocrystalline magnetic ceramics, R 2 CuO 2 superconducting and magnetic Materials, room temperature magnetic refrigeration materials, etc. These materials perform better and are more versatile. Their development will definitely play an important role in promoting the development of electronics, computer, and automatic control industries [1] .

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