Magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>100</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>solid solutions

TL;DRAbstract

In the equilibrium states, the solid solubility between Fe and Cu is negligibly small. Using vapor deposition, however, we produced ${\mathrm{Fe}}_{\mathit{x}}$${\mathrm{Cu}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$ solid solutions over the entire composition range. All the samples were crystalline: bcc structure at the Fe-rich side and fcc structure at the Cu-rich side. The transition from bcc to fcc occurred at around x=70, where the two phases were found to coexist. The fcc alloys exhibit a magnetic dilution leading to a magnetic percolation threshold at ${\mathit{x}}_{\mathit{c}}$\ensuremath{\simeq}18, rarely seen in binary Fe alloys. Below ${\mathit{x}}_{\mathit{c}}$, only spin-glass-like ordering is observed. Across the structure transition from fcc to bcc, there is a large discontinuity in ${\mathit{T}}_{\mathit{C}}$, and a very slight change in the atomic volume. Surprisingly, there are no noticeable discontinuities in the magnetic moment, hyperfine field, and isomer shift. The

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