Abstract: | Energy‐domain grazing‐incidence 57Fe‐Mössbauer spectroscopy (E‐GIMS) with synchrotron radiation (SR) has been developed to study surface and interface structures of thin films. Highly brilliant 57Fe‐Mössbauer radiation, filtered from SR by a 57FeBO3 single‐crystal nuclear Bragg monochromator, allows conventional Mössbauer spectroscopy to be performed for dilute 57Fe in a mirror‐like film in any bunch‐mode operation of SR. A theoretical and experimental study of the specular reflections from isotope‐enriched (57Fe: 95%) and natural‐abundance (57Fe: ~2%) iron thin films has been carried out to clarify the basic features of the coherent interference between electronic and nuclear resonant scattering of 57Fe‐Mössbauer radiation in thin films. Moreover, a new surface‐ and interface‐sensitive method has been developed by the combination of SR‐based E‐GIMS and the 57Fe‐probe layer technique, which enables us to probe interfacial complex magnetic structures in thin films with atomic‐scale depth resolution. |