Origin	Hong Kong(China)
Model Number	Y25
Brand Name	SUN LEI

Gan also known as oxygen or iron ferrite magnetic porcelain. As a class of non-metallic magnetic materials. Is a magnetic iron oxide with the other one or more metal oxides, mixed oxides (or are iron salts). Ferrite magnetic, at high frequency when a higher permeability rate (higher than the metallic magnetic material); its resistivity is much greater than that of metal magnetic materials, as well as a high dielectric properties. Magnetite FeO · Fe2O3 ferrite is the simplest. Is usually restricted by those with d ferrite layer or layers unpaired f electron elements, especially with divalent iron ion radius close to the divalent metal ions, such as manganese, zinc, copper, nickel, magnesium, cobalt ions, also some of the rare earth element ion or gallium, aluminum, bismuth, barium, strontium plasma.

 Ferrite magnetic material according to their coercivity (so as to enable the magnetization of the ferromagnetic material loses magnetic properties must be added to the original magnetization in the opposite direction of the external magnetic field strength) and uses can be divided into soft and hard magnetism, spin-magnetic, magnetic moment , Piezomagnectic five categories. Ferrite easy magnetization in weak magnetic field is also easy to demagnetization, such as Mn-Zn ferrite Mn-ZnFe2O4 and nickel zinc ferrite Ni-ZnFe2O4, spinel-type structure; the main to do all kinds of inductive components, such as filtering devices, transformers, antennas, etc. core and recording, video recorder heads. Hard magnetic ferrite magnetized difficult to demagnetization, magnetic long-term retention, such as barium ferrite BaFe12O17, structure, magnetic lead mostly rock type; mainly used for permanent magnetic source, in the telecommunications, electric sound, meter, electrical industry, can replace the aluminum Ni-Co hard magnetic metal material. Rotating magnetic ferrite, also known as microwave ferrite, such as nickel-copper ferrite Ni-CuFe2O4 and yttrium garnet ferrite 3M2O3 · 5Fe2O3 (M for trivalent yttrium, samarium, yttrium and other rare earth ions) for radar, navigation, remote control and other electronic devices. Ferrite magnetic moment has a rectangular hysteresis loop, such as lithium manganese ferrite Li-MnFe2O4, are generally used for memory components, used in computer memory. Piezomagnetic ferrite magnetization when the magnetic field direction can be stretched or compressed to make machinery, such as nickel-zinc ferrite Ni-ZnFe2O4, nickel-copper ferrite Ni-CuFe2O4, are generally for magnetostrictive components for ultrasonic transducers etc..

 Ferrite good performance, low cost, simple production technology, but also save a lot of precious metals, for the high-frequency weak in the promising field of non-metallic magnetic materials. But its relatively low saturation magnetization, usually 1/3-1/5 pure iron can not be used for power generation, electric, transmission transformers and other high-power electrical devices.