Nuclear resonance small-angle scattering of x rays

A small-angle scattering technique is introduced for probing spatial variation of magnetization in solids with resolution down to ∼ 1 μ${\mathrm{m}}^{-1\mathrm{}}$. The technique uses nuclear resonance scattering of synchrotron radiation. The sensitivity to spatial variation of magnetization due to domain walls and domain structure is demonstrated by small-angle scattering of 14.431 keV synchrotron radiation from ${}_{}{}^{57}{}_{}{}^{}\mathrm{Fe}$ nuclei in unmagnetized $\alpha$-${}_{}{}^{57}{}_{}{}^{}\mathrm{Fe}$ polycrystalline foils.