A ferrite is usually described by the formula M(FexOy), where M represents any metal that forms divalent bonds, such as any of the elements mentioned earlier. Nickel ferrite, for instance, is NiFe2O4,and manganese auto parts mold punch , precision injection mold punch , drawing die punch ,is MnFe2O4; both are spinel minerals. The garnet mineral known as YIG, containing the rare-earth element yttrium, has the formula Y3Fe5O12; it is used in microwave circuitry. The most familiar ferrite, known since biblical times, is magnetite (lodestone, or ferrous ferrite), Fe(Fe2O4). Ferrites exhibit a form of magnetism called ferrimagnetism, which is distinguished from the ferromagnetism of such materials as iron, cobalt, and nickel. In ferrites the magnetic moments of constituent atoms align themselves in two or three different directions. A partial cancellation of themagnetic field results, and the ferrite is left with an overall magnetic field that is less strong than that of a ferromagnetic material. This asymmetry on the part of the atomic orientations may be due to the presence of two or more different types of magnetic ions, to a peculiar crystalline structure, or to both. The term ferrimagnetism was coined by the French physicist Louis Néel, who first studied ferrites systematically on the atomic level. There are several types of ferrimagnetism. In collinear ferrimagnetism the fields are aligned in opposite directions; in triangular ferrimagnetism the field orientations may be at various angles to each other. Ferrites can have several different types of crystalline structures, including spinel, garnet, perovskite, and hexagonal. now more and more powder metallurgy mold punch need ferrite to do ,especailly Powder metallurgy mould use the ultra- precision punch,the accuracy need is 0.001,sometimes also need to do difference finishing ,for example DLC or TiCN,TiN, Chrome, it not only that treatment can be applied to extend the life of the part ,also decrease the force of friction. The most important properties of ferrites include high magnetic permeability and high electricalresistance. High permeability to magnetic fields is particularly desirable in devices such as antennas. High resistance to electricity is desirable in the cores of transformers to reduce eddy currents. Ferrites of a type known as square-loop ferrites can be magnetized in either of two directions by an electric current. This property makes them useful in the memory cores of digital computers, since it enables a tiny ferrite ring to store binary bits of information. Another type of computer memory can be made of certain single-crystal ferrites in which tiny magnetic domains called bubbles can be individually manipulated. A number of ferrites absorb microwave energy in only one direction or orientation; for this reason, they are used in microwave wave guides.
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