Fe foils with single-crystal-like texture for hyperfine interaction studies: Anisotropy of the hyperfine field in Fe

Abstract

$1\ensuremath{-}\ensuremath{\mu}\mathrm{m}$-thin polycrystalline Fe foils with sharp biaxial texture were produced. The importance of various preparation parameters for the sharpness of the texture was investigated. The use of the foils for nuclear magnetic resonance on oriented nuclei and modulated adiabatic fast passage on oriented nuclei measurements of the magnetic and electric hyperfine interactions of impurities in Fe was demonstrated by measurements on ${}^{192}\mathrm{Ir},$${}^{191}\mathrm{Pt},$${}^{198}\mathrm{Au},$ and ${}^{199}\mathrm{Au}.$ In particular, it was found that a strain-induced electric field gradient can arise from the cooling down of the foils on the Cu sample holder. This additional electric field gradient could be avoided by a thick Fe crystal between the foils and the sample holder. The magnetic hyperfine fields of Ir, Pt, and Au in Fe were shown to differ between the [100] and [110] orientations of the magnetization by ${B}_{\mathrm{HF}}^{[100]}\ensuremath{-}{B}_{\mathrm{HF}}^{[110]}=\ensuremath{-}0.073(8)\mathrm{T},$ $\ensuremath{-}0.003(6)\mathrm{T},$ and $\ensuremath{-}0.016(9)\mathrm{T},$ respectively.