If you say strong magnet, the first let us think of NdFeb, but ferrite can also be a "strong" magnet. Permanent magnet ferrite, also known as ferrite magnet steel, is the kind of small square black magnet encountered in childhood. The main raw materials of ferrite are iron, manganese, zinc three metal elements and iron oxide, barium carbonate or strontium carbonate. After magnetization, the strength of the residual magnetic field is higher and the retention time of the residual magnetic field is longer. Ferrite core is made of non-metallic magnetic material with compact and uniform ceramic structure and has low coercivity, also known as soft magnetic ferrite. Ferrites have the advantage of high permeability and high resistance and low eddy current losses over a wide range of frequencies. So ferrites are also called permanent magnet materials.
Ferrite belongs to the category of semiconductor electrically, so it is also called magnetic semiconductor. Magnetite (mainly Fe3O4) is a simple magnet. Ferrite magnet table magnetic because the material will not have more than 2000gs, generally around 1700gs will reach a peak. Usually used ferrite basic 1000-1200gs around the most. But it also has to do with the size of the magnet and things like that, and it also has to do with the measuring instrument, the Gaussian meter. Ferrite is sintered from iron oxides and other ingredients, generally can be divided into permanent magnet ferrite, soft magnetic ferrite and magnetic rotation ferrite three. Due to the low magnetic energy stored in the unit volume of ferrite, saturation magnetization is also low (usually only 1/3 ~ 1/5 of pure iron), thus limiting its application in the field of low frequency strong electricity and high power requiring higher magnetic energy density.
Injection molding ferrite, also known as bonded ferrite, is a new type of permanent magnet material, with large shape freedom, high dimensional accuracy, magnetic properties can be adjusted on demand, good product consistency, composite molding, directional freedom, and high mechanical strength. Magnetic products for injection molding. Including all kinds of laser printing magnetic roller, all kinds of precision small motor core parts, all kinds of positioning sensors, buzzer, contactless distributor.
Ferrite has been unable to become a truly "strong" magnet because of its shortcomings.
