Abstract
Using spin-polarized scanning tunneling microscopy (STM) we observe a two-dimensional c(2×2) antiferromagnetic state in a pseudomorphic Mn double layer on the W(001) surface. First-principles calculations confirm the antiferromagnetic ground state. Surprisingly, only the surface Mn layer possesses a magnetic moment while the moments of interface Mn atoms vanish. Calculated STM and spin-polarized STM images as well as local vacuum density of states are in good agreement with experiments and provide strong evidence of a dead magnetic interface layer.
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