  We propose a novel micromagnetic standard problem calculating the coercive
field for unpinning a domain wall at the interface of a multiphase magnet. This
problem is sensitive to discontinuities in material parameters for the exchange
interaction, the uniaxial anisotropy, and the spontaneous magnetization. We
derive an explicit treatment of jump conditions at material interfaces for the
exchange interaction in the finite-difference discretization. The micromagnetic
simulation results are compared with analytical solutions and show good
agreement. The proposed standard problem is well-suited to test the
implementation of both finite-difference and finite-element simulation codes.
