5. Characterization of a permanent magnet material

In short, such a material can be characterized on the basis of two groups of properties.

• Primary properties (linked to demagnetization curve)

  • The residual induction (B _r = µ ₀ M _r ) gives the residual induction in a closed circuit. It indicates the potential power of the magnet. A high value implies a good level of saturation µ ₀ M _s , which is provided by Fe and Co atoms, with high intrinsic magnetic moments.

  • The coercive field (H _c ), is the field capable of canceling...