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• W2330368603 abstract "Conversion electron Mossbauer spectroscopy (CEMS) and superconducting quantum interference device (SQUID) magnetometry have been applied to study the metastable iron monosilicide phase $(mathrm{c}text{ensuremath{-}}mathrm{FeSi})$ with the B2 (or $mathrm{CsCl}$) lattice structure synthesized by molecular beam epitaxy (MBE). Thin films of nominal composition of $mathrm{c}text{ensuremath{-}}{mathrm{FeSi}}_{0.85}$ were grown by codeposition of $^{57}mathrm{Fe}$ and Si onto $mathrm{MgO}(100)$ carrying a thin Fe or Cr buffer layer. X-ray diffraction was performed to determine the structure and epitaxial relationship of the $mathrm{c}text{ensuremath{-}}{mathrm{FeSi}}_{0.85}(100)$ films. The B2 structure was observed after different thermal annealing steps. The lattice parameter perpendicular to the film plane was found to be $2.77(5)phantom{rule{0.3em}{0ex}}mathrm{AA{}}$ in each case. The CEM spectra at room temperature could be decomposed into two components: (i) a weakly quadrupole-split doublet assigned to nonmagnetic stoichiometric $mathrm{c}text{ensuremath{-}}mathrm{FeSi}$, and (ii) a weakly ferromagnetic component characterized by a distribution of hyperfine magnetic fields, $Pmathrm{(}{B}_{mathrm{hf}}mathrm{)}$, assigned to a fraction of nonstoichiometric $mathrm{c}text{ensuremath{-}}{mathrm{FeSi}}_{x}$ with excess Fe. CEMS and SQUID magnetometry demonstrate the occurrence of magnetic ordering effects with decreasing temperature down to $4.2phantom{rule{0.3em}{0ex}}mathrm{K}.$ Our results reveal that, contrary to expectation, the stoichiometric $mathrm{c}text{ensuremath{-}}mathrm{FeSi}$ phase is paramagnetic at room temperature and ferromagnetically ordered below $ensuremath{sim}30phantom{rule{0.3em}{0ex}}mathrm{K}$, while $mathrm{c}text{ensuremath{-}}{mathrm{FeSi}}_{x}$ is ferromagnetic at and below $300phantom{rule{0.3em}{0ex}}mathrm{K}$. At $5phantom{rule{0.3em}{0ex}}mathrm{K}$ we find small ground-state Fe atomic magnetic moments ${ensuremath{mu}}_{mathrm{Fe}}$ of $(0.10ifmmodepmelsetextpmfi{}0.02)$ ${ensuremath{mu}}_{B}$ for $mathrm{c}text{ensuremath{-}}mathrm{FeSi}$ and $(0.13ifmmodepmelsetextpmfi{}0.03)$ ${ensuremath{mu}}_{B}$ for $mathrm{c}text{ensuremath{-}}{mathrm{FeSi}}_{x}$. These small moments are reflected in the observed small hyperfine magnetic fields of $2ensuremath{sim}4phantom{rule{0.3em}{0ex}}mathrm{T}$ in the ground state." @default.
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• W2330368603 date "2006-06-13" @default.
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• W2330368603 title "Magnetic and structural properties of epitaxial<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>c</mml:mi><mml:mtext>−</mml:mtext><mml:mi>FeSi</mml:mi></mml:mrow></mml:math>films grown on<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>MgO</mml:mi><mml:mo>(</mml:mo><mml:mn>100</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>" @default.
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• W2330368603 doi "https://doi.org/10.1103/physrevb.73.214423" @default.
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