Abstract
When the magnetic vector potential has but one component the governing field equation is the same as the heat conduction equation. In the case of ferro-magnetic materials the magnetic behavior is nonlinear, the permeability depending on the magnitude of the curl of the vector potential. Because the material property depends on the curl of the vector potential and not on the potential itself certain modifications to ADINAT are required in order to solve such problems. Spatial derivatives of the field variable must be explicitly computed and saved. Also, output is saved on disk for subsequent field line plotting. Once the flux field is calculated, the constitutive law due to Maxwell is used to compute the elements of the Maxwell stress tensor. This information is subsequently used to determine the net forces acting on magnetic structures.
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