Nuclear resonant reflectivity with standing waves for the investigation of a thin Fe-57 layer buried inside a superconducting Si/[Mo/Si](45)/(57) Fe/Nb multilayer

作者：Andreeva M A^*; Monina N G; Haggstrom L; Lindgren B; Kalska B; Kamali M S; Vdovichev S N; Salashchenko N N; Sernenov V G; Leupold O; Ruffer R

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2008, 266(1): 187-196.

DOI：10.1016/j.nimb.2007.10.026

• synchrotron radiation
• nuclear resonant reflectivity
• standing waves
• hyperfine interactions
• superconductivity

A special multilayer sample Si/[Mo/Si](45)/(57) Fe/Nb has been prepared for the depth selective investigations of the hyperfine fields in thin iron layer at low temperatures above and below the superconducting transition in the top Nb layer (T-c similar to 8 K) by means of the nuclear resonant reflectivity with standing waves. The periodic multilayer [Mo/Si](45) below the iron layer in our sample was used as "a standing wave generator". A weak magnetic hyperfine splitting in the Fe-57 layer was detected just at low temperature. A slight variation of the nuclear resonant refiectivity time spectra measured above and below T-c was observed. At first it was supposed that this change of the spectrum shape is caused by the spatial modulation of ferromagnetic domains in the Fe-57 layer caused by a proximity effect. A closer analysis, however, reveals that the spectrum variations are due to just the changes of the relative weights of the magnetic and paramagnetic phases in Fe-57 layer.

• 出版日期2008-1