Abstract
We have used NMR and M\"ossbauer spectroscopy to investigate the magnetism and spin-glass behavior in $\mathrm{Fe}{\mathrm{Al}}_{2}$. The results show that the observed behavior can be interpreted as local-moment magnetism residing on the Fe sites. An increase in $^{57}\mathrm{Fe}$ M\"ossbauer magnetic hyperfine field was observed at the $35\text{\ensuremath{-}}\mathrm{K}$ spin-glass freezing temperature, with a reduced low-temperature value consistent with unquenched fluctuations in the spin-glass state. However, the $^{27}\mathrm{Al}$ NMR shifts and spin-lattice relaxation behavior are consistent with transfer hyperfine interactions to Fe local moments, with a magnitude of approximately $2.5\phantom{\rule{0.3em}{0ex}}{\ensuremath{\mu}}_{B}$. This value is consistent with the bulk magnetization, but surprising compared to other Fe aluminides, given the small $\mathrm{Fe}\ensuremath{-}\mathrm{Fe}$ coordination number and associated weakening expected for the magnetic moment.
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