  The interface stresses at of the solid-melt interface are, in general,
anisotropic. The anisotropy in the interfacial stress can be evaluated using
molecular dynamics (MD) and phase field crystal (PFC) models. In this paper, we
report our results on the evaluation of the anisotropy in interface stress in a
BCC solid with its melt. Specifically, we study Fe using both MD and PFC
models. We show that while both MD and PFC can be used for the evaluation, and
the PFC and the amplitude equations based on PFC give quantitatively consistent
results, the MD and PFC results are qualitatively the same but do not match
quantitatively. We also find that even though the interfacial free energy is
only weakly anisotropic in BCC interfacial stress anisotropy is strong. This
strong anisotropy has implications for the equilibrium shapes, growth
morphologies and other properties at nano-scale in these materials.
