We have studied the magnetic and structural properties of epitaxial bcc Fe(001) films grown at 175 ^∘{}C on molecular-beam epitaxy-prepared GaAs(001)-2×{}4 and -c(4×4) reconstructed surfaces, with film thicknesses ranging up to {~}30 ML ({~}43 {}). We present measurements of the thickness-dependent evolution of the magnetic properties of the Fe films as determined by in situ magneto-optic Kerr effect. We find that the magnetic properties and growth mode are similar for both 2×{}4 and c(4×4) reconstructions, although the initial adsorption sites and island nucleation as measured by scanning tunneling microscopy are clearly dominated by the substrate surface reconstruction. The onset of room-temperature ferromagnetism occurs at 6 ML for growth on both GaAs surface reconstructions. At this coverage, the measured Curie temperature ({~}100 ^∘{}C) is significantly reduced from that of bulk {α}-Fe (770 ^∘{}C). The anisotropy is dominated by a uniaxial component such that the two 〈110〉 axes are inequivalent for all coverages studied. Shape anisotropy does not appear to play a significant role.
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Kneedler et al. (1997) studied this question.
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