Views: 0 Author: Site Editor Publish Time: 2023-02-27 Origin: Site
Ferrite magnets are formed by reacting iron oxide (iron oxide or rust) with any of many other metals, including magnesium, aluminum, barium, manganese, copper, nickel, cobalt, and even iron itself.
What are the industrial applications of ferrite magnets?
What are the properties of ferrite magnets?
What is the raw material for the production of ferrite magnets?
Ferrite magnets is a functional material that generates a magnetic field. Soft ferrite magnets is a ferromagnetic oxide with Fe2O3 as the main component, which is produced by powder metallurgy. There are several types such as Mn-Zn, Cu-Zn, Ni-Zn, etc. Among them, the output and dosage of Mn-Zn ferrite magnets are the largest, and the resistivity of Mn-Zn ferrite magnets is low, which is 1 to 10 ohms/meter. Use at frequencies below 100kHZ. The magnetic permeability of telecom ferrite magnets is from 750 to 2300, with low loss factor, high quality factor Q, and stable permeability with temperature/time. It is the slowest decline in permeability during operation, about Decrease by 3% to 4% every 10 years.
Ferrite magnets can be isotropic or anisotropic. Isotropic ferrite magnets can be magnetized in any direction, but are less magnetic. Anisotropic ferrite magnets have a preferred direction of magnetization within the structure and have the strongest magnetic properties along that direction (they are stronger than isotropic ferrite magnets). Ferrite magnets come in two chemical varieties. Strontium ferrite has two chemical symbols: - SrFe12O19 or SrO.6Fe2O3. Barium ferrite also has two chemical symbols BaFe12O19 or BaO.6Fe2O3.
Ferrite magnets are usually described by the molecular formula M(FexOy), where M stands for any metal that forms a divalent bond, such as any of the elements mentioned earlier. For example, nickel ferrite is NiFe2O4 and manganese ferrite is MnFe2O4; both are spinel minerals. The garnet mineral YIG, which contains the rare earth element yttrium, has the molecular formula Y3Fe5O12; it is used in microwave circuits. The most familiar ferrite since biblical times is magnetite (magnetite, or ferrite), Fe(Fe2O4). Ferrite magnets exhibit a magnetic property called subferromagnetic (q.v.), as opposed to the ferromagnetism of materials such as iron, cobalt, and nickel.
In ferrite, the magnetic moments of the constituent atoms are aligned in two or three different directions. This leads to a partial cancellation of the magnetic field and the ferrite leaves an overall magnetic field strength that is lower than that of the ferromagnetic material. This asymmetry in the atomically oriented part may be due to the presence of two or more different types of magnetic ions, or to a special crystal structure, or both. The term subferromagnetism was coined by the French physicist Louis Néel, who first studied ferrites systematically at the atomic level.
There are several types of ferrite magnetism. In co-linear ferrite magnetism, the fields are aligned along opposite directions; in triangular ferrite magnetism, the field directions can be at different angles to each other. Ferrites can have several different types of crystal structures, including spinel, garnet, chalcocite, and hexagonal crystals.
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