ISOTROPIC The material has no preferred direction of orientation and can therefore be magnetized in any direction ANISOTROPIC A preferred magnetic axis has been induced during manufacture in order to obtain higher magnetic properties in that direction. Anisotropic magnets can only be magnetized in that direction DEMAGNETIZATION CURVE The hysteresis loop in the second quadrant and used to define the main properties of permanent magnet materials. REMANENCE Br This is the flux density in the magnetic material at zero air gap (Field strength=0), which remains after magnetization to saturation and then removing the magnetizing field. Units: mT, T or G, kG. COERCIVE FORCE HcB The demagnetizing field strength in order to bring the polarizing J to zero from saturation. Units: kA/m or Oe, kOe. INTRINSIC COERCIVE FORCE HcJ The demagnetizing field strength in order to bring the polarization J to zero from saturation. Units: kA/m or Oe, kOe. MAXIMUM ENERGY PRODUCT (B*H) max The maximum product of B and H on the demagnetization curve. This is the highest energy produced by the magnet, the optimal working point. Units: kJ/m3 or MGOe. WORKING POINT The point on the demagnetization curve where the value of B and H correspond to the actual working conditions. TEMPERATURE COEFFICIENT This indicates the reversible change in Br or Hc because of changes in temperature. This is normally shown as a percentage per degree C, starting at 20 degree C. MAXIMUM OPERATING TEMPERATURE This maximum temperature is very dependent of the working point of the magnet. CURIE TEMPERATURE Above this temperature the magnets will loose their magnetism permanently.