What is the temperature dependence of permanent magnets?
Different permanent magnet groups respond differently to changes in operating temperature, for example ferrite shows an increase in Hc as the temperature is increased while the rest of the magnet types show a decrease. All groups show a decrease in Br as temperature increases, and all become non-magnetic eventually at a temperature called the Curie temperature, Tc. The most common temperature related parameters for the types of magnets are: NdFeB tends to be used with a -40oC to 200oC temperature window, depending on the alloy composition and binder characteristics.
