Photoelectron diffraction study of ultrathin Fe films on Cu{111}

Using photoelectron diffraction in the scanned-energy mode we show that at 300 K iron grows pseudomorphically on Cu{111} up to a thickness of about tw o equivalent monolayers. The Fe-Cu layer separation is 1.99 Angstrom. Above this thickness the film becomes bcc with {110} orientation and is aligned such that the [111] rows are parallel to the [110] rows of the fcc{111} sur face (Kurdjumov-Sachs orientation). The Fe-Fe first-layer separation is 1.9 5 Angstrom. [S0163-1829(99)01903-7].