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arXiv · 1605.06822

Epitaxially stabilized iron thin films via effective strain relief from steps

T. Miyamachi·S. Nakashima·S. Kim·N. Kawamura·Y. Tatetsu·Y. Gohda·S. Tsuneyuki·F. Komori
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Abstract

We show a new way to stabilize epitaxial structures against transforming bulk stable phases for Fe thin films on a vicinal Cu(001) surface. Atomically-resolved observations by scanning tunneling microscopy reveal that high-density Cu steps serve as strain relievers for keeping epitaxially-stabilized Fe fcc(001) lattice even at a transient thickness towards the bulk stable bcc(110) lattice. Spectroscopic measurements further clarify the intrinsic electronic properties of the fcc Fe thin film in real space, implying electronic differences between 6 and 7 monolayer thick films induced by the modification of the lattice constant in the topmost layers.

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T. Miyamachi, S. Nakashima, S. Kim, N. Kawamura, Y. Tatetsu, Y. Gohda, S. Tsuneyuki, F. Komori. 2016-05-22. Epitaxially stabilized iron thin films via effective strain relief from steps. https://doi.org/10.1103/physrevb.94.045439

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