Magnetic MaterialsFirst created: Mon May 28 2001
Last updated: Mon May 28 2001
The magnets used in the probe are of ceramic type.
More exotic magnets are available that have better temperature stabilty.
Magnet Physical Data
Ceramic (Ferrite) Magnet is manufactured from oxide materials using powder metallurgical process. Ceramic magnet is most widely used because of its low cost, high-energy, good electric insulation and excellent resistance to demagnetization. The most common type of ceramic magnets are anisotropic strontium, anistropic barium and isotropic barium magnet.
SmCo (Samarium Cobalt) Magnet is one of kind of rare earth maget with a high percentage of samarium, whitch is relatively stable against temperature change. With high energy product and excellent coercove force, this material is ideally compact and suitable to highly efficient machines and components, and widely used in application in which higher operation temperature, higher corrosion and oxidation resistance are crecial. Two common compositions of this kind of magnet are Sm1Co5 and Sm2Co17.
AlNiCo (Aluminum-Nickle-Cobalt) Magnet is high-energy permanent magnet, which posses high flux density, high coercive, high energy product and extreme stability for temperature changes. It exhibits good resistance to demagnetization, stability in high temperatures and excellent conduction.
reference: descriptions from magtek
Br is the measure of its residual magnetic flux density in Gauss, which is the maximum flux the magnet is able to
produce. ( 1Gauss is like 6.45 lines/sq in)
BTW, the "Tcoef of Br" numbers are for °C and should be multiplied by .55 (5/9) when using °F.