The Magnetic Shielding node adds a boundary condition for magnetic shielding. It describes a thin layer of a highly permeable medium that shields the magnetic field. Because of the presence of this thin layer, the tangential components of the magnetic field and vector potential have discontinuities given by:

In this equation, ds is the surface layer thickness and the relation between the tangential magnetic field Ht and flux density Bt inside the layer can be linear and given by a relative permeability or nonlinear and given by the HB curve of the layer material.

Enter a value or expression for the Surface thickness ds (SI unit: m).

Select Relative permeability μr (dimensionless) to use the constitutive relation B = μ0μrH. The default uses values From material. For User defined enter another value or expression.

Select HB curve |H| (SI unit: A/m) to use a curve that relates magnetic flux density B and the magnetic field H as |H| = f(|B|). The Magnetic field norm setting can take the values From material or User defined.