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Scanning Tunneling Microscopy Study of Square Manganese Tetramers on Mn3N2 (001)

Rong Yang, Haiqiang Yang, Arthur R. Smith

cond-mat.mtrl-sciarXiv:cond-mat/0512104

Abstract

We have investigated the growth of antiferromagnetic Mn3N2(001) on MgO (001) by molecular beam epitaxy and scanning tunneling microscopy . The images show smooth terraces and atomic steps. On some of the terraces a unique and new reconstruction is seen, resolved as square Mn tetramers in a c(4x2) structural arrangement. Two domains of the tetramer reconstruction, rotated by 90 to each other, occur. A model is presented for this square Mn tetramer reconstruction, in which the Mn atoms of the tetramer layer belong to the Mn layer at the surface in the MnN-MnN-Mn stacking sequence.

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