Nuclear Resonant Reflectivity Investigations of a Thin Magnetic ~(57)Fe Layer Adjacent to a Superconducting V Layer

摘要

With nuclear resonant scattering of synchrotron radiation we have investigated the magnetic hyperfine fields of a thin (～2 nm) ~(57)Fe layer below and above the superconducting temperature of an adjacent thick (～50 nm) V cap layer. A standing wave enhancement of the nuclear resonant reflectivity from the buried ~(57)Fe layer was achieved by a periodic superstructure [~(56)Fe/V]_(25) created below the resonant layer. No visible variation of the magnetization in the ~(57)Fe layer below and above the superconducting transition temperature was observed (neither at the critical angle, nor at the Bragg peak). The strong exchange interaction in the investigated ~(57)Fe layer can explain the result.