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- W2035882007 abstract "Fe wedges (0--20 AA{}) and films have been grown epitaxially onto diamond $mathrm{C}(100)$substrates, and their metastable structural and magnetic phases were studied by means of reflection high-energy electron diffraction (RHEED), the surface magneto-optic Kerr effect (SMOKE), and in situ Mossbauer spectroscopy. Both the substrate and films $<~5mathrm{ML}$ thick, that were grown at room temperature and subsequently annealed, show $1ifmmodetimeselsetexttimesfi{}1$ streaks in the RHEED patterns, indicating a flat, well-ordered fcc structure. Films $>5mathrm{ML}$ thick exhibit a three-dimensional bcc RHEED pattern. No magnetic signal was observed in either longitudinal or polar SMOKE measurements that were taken between 120 and 300 K for Fe thickness $<5mathrm{ML}.$ For $>5.5ensuremath{-}mathrm{ML}$ Fe, the films are ferromagnetic with in-plane easy axis, and the saturation magnetization (at 130 K) increases linearly with Fe thickness. In situ Mossbauer spectra for a 4-ML-thick ${}^{57}mathrm{Fe}$ film exhibit a spectral line typical of paramagnetic fcc Fe at 300 and 70 K. This line broadens considerably at 40 and 35 K due to magnetic hyperfine interaction, indicating a low-moment antiferromagnet. These results indicate that 5 ML is the fcc-bcc phase boundary that separates low-moment antiferromagnetic from ferromagnetic ground states, respectively." @default.
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- W2035882007 date "1998-04-15" @default.
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- W2035882007 title "Structural and magnetic phases of ultrathin Fe wedges and films grown on diamond (100)" @default.
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- W2035882007 doi "https://doi.org/10.1103/physrevb.57.10044" @default.
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