Work functions and magnetic moments of C atom adsorbed Mn/Fe(001) surfaces with different C atom coverages θ and magnetic alignments(PL:parallel or APL1: antiparallel) between Mn and Fe atom moments are investigated using first-principles methods based on density functional theory.The calculated results reveal that the spin configuration plays a significant role in determining the work function of the system.The work functions of the systems with parallel states are evidently smaller than those with antipar...