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- W1525101845 abstract "Epitaxial Fe16N2 films were grown on Si(001) substrates with an Ag underlayer by reactive sputtering in nitrogen. Pure α′-Fe8N films were obtained which on subsequent annealing resulted in mixtures of α′-Fe8N (54%) and α′′-Fe16N2 (46%). An average moment of 1780 emu/cc, considerably larger than that of pure α-Fe (1714 emu/cc), was measured for both samples. Plan-view transmission electron microscopy of the films confirms the orientation relationship Fe16N2(001)‖Ag(001)‖Si(001) and Fe16N2[100]‖Ag[110]‖Si[100], and a small grain size (∼100 Å), while electron energy-loss spectroscopy confirms an average composition of Fe8N for both samples. Electron diffraction patterns indicate that the as-deposited α′ films already contain very small regions of ordered α′′ which were not previously detected by x-ray diffraction measurements. Mössbauer spectroscopy performed at both 300 and 16 K gave three hyperfine fields corresponding to three different iron sites for both the unannealed α′ and the annealed α′/α′′ mixtures. Lorentzian fitting of the three iron components for the α′/α′′ spectrum obtained at room temperature gave an intensity ratio of 1:2:1 (FeI:FeII:FeIII) corresponding to the expected occupancy for the three Fe sites in the Fe16N2 structure. Moreover, the pure α′ film at 300 K and both samples at 16 K showed deviation from this distribution. The three components show notable differences in the temperature dependence of their occupancies; however, all three magnetic components deviate similarly from the surface normal." @default.
- W1525101845 created "2016-06-24" @default.
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- W1525101845 date "1997-04-15" @default.
- W1525101845 modified "2023-09-28" @default.
- W1525101845 title "Magnetic and physical microstructure of Fe16N2 films grown epitaxially on Si(001)" @default.
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- W1525101845 doi "https://doi.org/10.1063/1.365102" @default.
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