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A. Biedermann, R. Tscheließnig, M. Schmid, P. Varga:
"Local atomic structure of ultra-thin Fe films grown on Cu(100)";
Applied Physics A: Materials Science & Processing, 78 (2004), 807 - 816.

Ultra-thin epitaxial Fe films grown by thermal deposition on Cu(100) are analyzed by scanning tunneling microscopy. Evidence is
presented that the morphological characteristics and magnetic properties are a direct consequence of fcc-to-bcc transitions
reminiscent of those occurring in bulk Fe. In contrast to the assumption of a ferromagnetic fcc phase in previous models of the
Fe/Cu(100) system, we observe a tightly twinned and strained bcc-like phase termed nanomartensite in films below 5 ML
thickness, which encompasses almost the entire film volume of 3 ML films. In addition, the surface of 7-8 ML films reconstructs
by forming non-close-packed structures with bcc-like bond angles. The formation of these bcc-like phases is the reason for the
expansion of the interlayer spacing observed in these films and correlates perfectly with their ferromagnetic ordering.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04970064

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